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How to prevent cleaner from hanging my lock screen in Ubuntu 16.04

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4

In my workplace I'm using Ubuntu 16.04 with unity, standard installation. When I leave my office I lock my screen (ctrl+alt+l). During the evening, the office is cleaned. A few times, I've got back to work in the morning and my headphones are on my keyboard. My lock screen is hung, I can't clear password field, can't type anything, and can't use any other controls on lock screen (reboot, turn off button etc.). The mouse is working but clicking does nothing. Probably this is because the password field took huge input overnight and broke everything else. The cleaner "hacked" my computer :)

How can I prevent this? Can I somehow limit how many characters can be passed to the password input? Can I block the lock screen until I use some key combination to enable password input? Something similar to ctrl+alt+del in Windows before I can input password to lock screen?

//EDIT
As @bytecommander wrote there was a bug for this and it is supposed to be fixed but somehow this does not work on my machine https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

$ apt policy unity-greeter                                                                                                                                            

unity-greeter:

  Installed: 16.04.2-0ubuntu1

  Candidate: 16.04.2-0ubuntu1

  Version table:

 *** 16.04.2-0ubuntu1 500

        500 http://pl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

        100 /var/lib/dpkg/status

16.04 unity lock-screen

share|improve this question

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Power it down, take it home with you, unplug the keyboard if it's not a laptop, tell hr, AFAIR there's not much you can do security wise once someone physically gets a hold of your machine
  
  – j-money
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @j-money I don't think the lady attempts to hack the machine but rather think she just thoroughly cleans the keyboard thereby pressing all the keys. A dust cover and/or this note might help.
  
  – PerlDuck
  3 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @PerlDuck maybe that's what she wants you to think!! (couldn't resist)
  
  – j-money
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unplug the keyboard :)
  
  – Sauce
  2 hours ago
  

  
  
  
  

add a comment | 

4

In my workplace I'm using Ubuntu 16.04 with unity, standard installation. When I leave my office I lock my screen (ctrl+alt+l). During the evening, the office is cleaned. A few times, I've got back to work in the morning and my headphones are on my keyboard. My lock screen is hung, I can't clear password field, can't type anything, and can't use any other controls on lock screen (reboot, turn off button etc.). The mouse is working but clicking does nothing. Probably this is because the password field took huge input overnight and broke everything else. The cleaner "hacked" my computer :)

How can I prevent this? Can I somehow limit how many characters can be passed to the password input? Can I block the lock screen until I use some key combination to enable password input? Something similar to ctrl+alt+del in Windows before I can input password to lock screen?

//EDIT
As @bytecommander wrote there was a bug for this and it is supposed to be fixed but somehow this does not work on my machine https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

$ apt policy unity-greeter                                                                                                                                            

unity-greeter:

  Installed: 16.04.2-0ubuntu1

  Candidate: 16.04.2-0ubuntu1

  Version table:

 *** 16.04.2-0ubuntu1 500

        500 http://pl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

        100 /var/lib/dpkg/status

16.04 unity lock-screen

share|improve this question

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Power it down, take it home with you, unplug the keyboard if it's not a laptop, tell hr, AFAIR there's not much you can do security wise once someone physically gets a hold of your machine
  
  – j-money
  4 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @j-money I don't think the lady attempts to hack the machine but rather think she just thoroughly cleans the keyboard thereby pressing all the keys. A dust cover and/or this note might help.
  
  – PerlDuck
  3 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @PerlDuck maybe that's what she wants you to think!! (couldn't resist)
  
  – j-money
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unplug the keyboard :)
  
  – Sauce
  2 hours ago
  

  
  
  
  

add a comment | 

In my workplace I'm using Ubuntu 16.04 with unity, standard installation. When I leave my office I lock my screen (ctrl+alt+l). During the evening, the office is cleaned. A few times, I've got back to work in the morning and my headphones are on my keyboard. My lock screen is hung, I can't clear password field, can't type anything, and can't use any other controls on lock screen (reboot, turn off button etc.). The mouse is working but clicking does nothing. Probably this is because the password field took huge input overnight and broke everything else. The cleaner "hacked" my computer :)

How can I prevent this? Can I somehow limit how many characters can be passed to the password input? Can I block the lock screen until I use some key combination to enable password input? Something similar to ctrl+alt+del in Windows before I can input password to lock screen?

//EDIT
As @bytecommander wrote there was a bug for this and it is supposed to be fixed but somehow this does not work on my machine https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

$ apt policy unity-greeter                                                                                                                                            

unity-greeter:

  Installed: 16.04.2-0ubuntu1

  Candidate: 16.04.2-0ubuntu1

  Version table:

 *** 16.04.2-0ubuntu1 500

        500 http://pl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

        100 /var/lib/dpkg/status

16.04 unity lock-screen

share|improve this question

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

$ apt policy unity-greeter                                                                                                                                            

unity-greeter:

  Installed: 16.04.2-0ubuntu1

  Candidate: 16.04.2-0ubuntu1

  Version table:

 *** 16.04.2-0ubuntu1 500

        500 http://pl.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

        100 /var/lib/dpkg/status

share|improve this question

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

share|improve this question

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

edited 7 mins ago

David Richerby

29639

edited 7 mins ago

David Richerby

29639

asked 4 hours ago

piotrekkrpiotrekkr

2331310

asked 4 hours ago

piotrekkrpiotrekkr

2331310

3 Answers
3

active

oldest

votes

8

Seems like your cleaning lady has successfully managed to emulate a cat.

https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

There was a bug in unity-greeter in 14.04 and up to 16.04, which caused the lock screen to become unresponsive when there has been excessive keyboard input for some time (figuratively and literally a "cat on the keyboard").

It should be fixed since unity-greeter version 16.04.2-0ubuntu1 though by implementing a character limit. Please check your installed version with

apt policy unity-greeter

and make sure your system is fully updated with

sudo apt update ; sudo apt upgrade

share|improve this answer

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have version with fix: apt policy unity-greeter unity-greeter: Installed: 16.04.2-0ubuntu1 Candidate: 16.04.2-0ubuntu1 Version table: *** 16.04.2-0ubuntu1 500 and apparently it is not fixed...
  
  – piotrekkr
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  In that case I think you should (re)open a bug ticket :(
  
  – Byte Commander
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I love that cats could trigger a bug :)
  
  – Thorbjørn Ravn Andersen
  11 mins ago
  

  
  
  
  

add a comment | 

1

You can install xtrlock:

$ sudo apt-get install xtrlock

And made a combination for lock screen and lock keyboard, until you press the combination again. Make it hard and then the cleaning lady have a hard chance to hit and "hack" your computer.

I hope it help you with that. Regards

share|improve this answer

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

Another solution is to buy a wireless keyboard, then stash the keyboard in a drawer before leaving, or taking out the USB dongle.

Pros: no need to install any software or mess with settings.

Cons: cost a bit of money, requires extra action before leaving.

share

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

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8

Seems like your cleaning lady has successfully managed to emulate a cat.

https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

There was a bug in unity-greeter in 14.04 and up to 16.04, which caused the lock screen to become unresponsive when there has been excessive keyboard input for some time (figuratively and literally a "cat on the keyboard").

It should be fixed since unity-greeter version 16.04.2-0ubuntu1 though by implementing a character limit. Please check your installed version with

apt policy unity-greeter

and make sure your system is fully updated with

sudo apt update ; sudo apt upgrade

share|improve this answer

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have version with fix: apt policy unity-greeter unity-greeter: Installed: 16.04.2-0ubuntu1 Candidate: 16.04.2-0ubuntu1 Version table: *** 16.04.2-0ubuntu1 500 and apparently it is not fixed...
  
  – piotrekkr
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  In that case I think you should (re)open a bug ticket :(
  
  – Byte Commander
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I love that cats could trigger a bug :)
  
  – Thorbjørn Ravn Andersen
  11 mins ago
  

  
  
  
  

add a comment | 

8

Seems like your cleaning lady has successfully managed to emulate a cat.

https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

There was a bug in unity-greeter in 14.04 and up to 16.04, which caused the lock screen to become unresponsive when there has been excessive keyboard input for some time (figuratively and literally a "cat on the keyboard").

It should be fixed since unity-greeter version 16.04.2-0ubuntu1 though by implementing a character limit. Please check your installed version with

apt policy unity-greeter

and make sure your system is fully updated with

sudo apt update ; sudo apt upgrade

share|improve this answer

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have version with fix: apt policy unity-greeter unity-greeter: Installed: 16.04.2-0ubuntu1 Candidate: 16.04.2-0ubuntu1 Version table: *** 16.04.2-0ubuntu1 500 and apparently it is not fixed...
  
  – piotrekkr
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  In that case I think you should (re)open a bug ticket :(
  
  – Byte Commander
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I love that cats could trigger a bug :)
  
  – Thorbjørn Ravn Andersen
  11 mins ago
  

  
  
  
  

add a comment | 

Seems like your cleaning lady has successfully managed to emulate a cat.

https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1538615

There was a bug in unity-greeter in 14.04 and up to 16.04, which caused the lock screen to become unresponsive when there has been excessive keyboard input for some time (figuratively and literally a "cat on the keyboard").

It should be fixed since unity-greeter version 16.04.2-0ubuntu1 though by implementing a character limit. Please check your installed version with

apt policy unity-greeter

and make sure your system is fully updated with

sudo apt update ; sudo apt upgrade

share|improve this answer

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

apt policy unity-greeter

sudo apt update ; sudo apt upgrade

share|improve this answer

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

answered 4 hours ago

Byte CommanderByte Commander

65.2k27178300

1

You can install xtrlock:

$ sudo apt-get install xtrlock

And made a combination for lock screen and lock keyboard, until you press the combination again. Make it hard and then the cleaning lady have a hard chance to hit and "hack" your computer.

I hope it help you with that. Regards

share|improve this answer

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

You can install xtrlock:

$ sudo apt-get install xtrlock

And made a combination for lock screen and lock keyboard, until you press the combination again. Make it hard and then the cleaning lady have a hard chance to hit and "hack" your computer.

I hope it help you with that. Regards

share|improve this answer

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

You can install xtrlock:

$ sudo apt-get install xtrlock

And made a combination for lock screen and lock keyboard, until you press the combination again. Make it hard and then the cleaning lady have a hard chance to hit and "hack" your computer.

I hope it help you with that. Regards

share|improve this answer

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

$ sudo apt-get install xtrlock

share|improve this answer

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 4 hours ago

SantiSanti

152

New contributor

Santi is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 4 hours ago

SantiSanti

152

0

Another solution is to buy a wireless keyboard, then stash the keyboard in a drawer before leaving, or taking out the USB dongle.

Pros: no need to install any software or mess with settings.

Cons: cost a bit of money, requires extra action before leaving.

share

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

Another solution is to buy a wireless keyboard, then stash the keyboard in a drawer before leaving, or taking out the USB dongle.

Pros: no need to install any software or mess with settings.

Cons: cost a bit of money, requires extra action before leaving.

share

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Another solution is to buy a wireless keyboard, then stash the keyboard in a drawer before leaving, or taking out the USB dongle.

Pros: no need to install any software or mess with settings.

Cons: cost a bit of money, requires extra action before leaving.

share

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 2 mins ago

Shadow WizardShadow Wizard

1057

New contributor

Shadow Wizard is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 2 mins ago

Shadow WizardShadow Wizard

1057