[ALUG] Strange PC lock-up

Mark Rogers mark at more-solutions.co.uk
Wed Mar 22 13:42:55 GMT 2017

Several times over the past few weeks I've had my PC (Ubuntu 16.10*)
apparently lock up: desktop stops changing (clock stops updating) but
the mouse (usually) continues to move. Sometimes I can SSH in,
although more often I can get as far as entering username/password but
never reach a terminal prompt.

It can happen while I'm actively using it (mid-sentence), or if I go
away and come back it could have locked in my absence, often
relatively shortly after it was left (the stopped clock is quite

I found messages in syslog relating to nouveau so I replaced the
graphics card (as a fairly cheap swap out). That made no difference
(actually if anything it got worse, although I'd hesitate to say so
for sure).

Rather than mess around I bought a new PC and transferred my system
disk to it, still figuring it felt like a hardware issue. Except that
the problem has followed across onto the new PC. The only things moved
across are the new graphics card and three hard disks.

It no longer feels like a hardware issue....

How do I diagnose?

Or am I just looking at a re-install?

* Note that this PC has been upgraded through several versions, it
wasn't a clear 16.10 install. The only "major" change recently has
been a shift from Chrome to Opera as the primary browser (and since I
tend to have dozens of tabs open and most of my work involves a
browser in some way that does count as a major change).

Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450
Registered in England (0456 0902) 21 Drakes Mews, Milton Keynes, MK8 0ER

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