I have upgraded from ubuntu 15.04 to 16.04 LTS last week and since then it frequently stops responding completely and I have to use the power button to shut it down . Please tell what to do so that the problem can be solved without shutting it down ( as I lose that session and all my work is dicarded without being saved ) .
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uuuuh what you did actually... I think. Other options are for techie people I bet this would also happen in System76, Entroware and other pre-installed laptops. – userDepth May 06 '16 at 09:46
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Try to use virtual console by command:
ctrl + alt + F1
here you can check your processes by top command.
Exit from console: ctrl + alt + F8
r0den
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I also encountered a similar problem a while ago. The problem was with the default video driver and it was solved when I changed it (in my case, I changed the default one to 'fglrx-updates (proprietary)' driver for my AMD graphic card). I am also a newbie to Ubuntu. So I am not sure it is the same problem with you. However you can try changing the video driver from
System Settings > Software Sources > Additional Drivers
doca
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I also found that Mate was using the Noveua or wtv driver when my card used Skylake in the past. – userDepth May 06 '16 at 09:42
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Switching to a virtual console and then killing LightDm and restarting it does the trick without having to reboot the whole computer
ctrl + alt + F1 - F7
ps xf | grep lightdm
kill pid
The Letter M
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To achieve a similar behaviour to pressing Ctrl+Alt+Del in Windows, bind that key to the System Monitor program, and from there you will be able to get some insights on what process is eating up your performance and kill it.
More on that here.
By the way, you can click on Ctrl+Alt+Esc and launch xkill, more on that here.
Rafs
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