Hello Kay, 

Yes, locks the whole machine means it is dead in the water- no mouse, no other 
windows can be activated, no sequence of buttons (e.g. Ctrl-Alt-Del, Ctrl-C, 
etc) to stop or bring anything back to life. What I would call a classic case 
of the machine crashing- the window with the molecule is there, I just can't do 
anything. 
I can look into the magic SysRq system and see if that can help at all. 

Cheers, tom 

-----Original Message-----
From: CCP4 bulletin board [mailto:CCP4BB@JISCMAIL.AC.UK] On Behalf Of Kay 
Diederichs
Sent: Monday, 15 July 2019 4:24 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] [ExternalEmail] [ccp4bb] coot crashing

Hi Tom,

does "locks my whole machine" mean that you cannot open another terminal 
window? If you still can, use the "ps -ef | grep coot" command to find out if 
the coot process still exists, and note its process id ("pid"). If it does, 
remove it with "kill -9 <pid>". 
Or does the window system crash? This would be a bug of the latter.
Or does (the crashed) coot still take input focus, with the effect that you 
cannot use your mouse to activate another window? In that case, try "Alt-tab" 
to switch window focus.
Or can you not even type in another window? For such cases, it pays off to set 
up the machine for the "Alt-SysRq"commands; see 
https://en.wikipedia.org/wiki/Magic_SysRq_key . These can be used to trigger a 
reboot. On Linux I see rarely a need to reset a machine with the power button. 

HTH,
Kay

On Mon, 15 Jul 2019 05:24:38 +0000, Peat, Tom (Manufacturing, Parkville) 
<tom.p...@csiro.au> wrote:

>Hello again, 
>
>To be more specific- sometimes when Coot crashes, I can just restart Coot. 
>Sometimes it locks my whole machine (maybe 30% of the time) and I need to 
>reboot. 
>The former is just a small pain, the latter is a true pain and I prefer 
>software not to crash the machine in such an untidy way. 
>
...
>
>I'm currently using Ubuntu 18.04.2 LTS and I think I'm reasonably up to date 
>wrt updates... 
>

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