Public bug reported:
Last week I upgraded from 12.04 LTS to 14.04 LTS and then immediately to
16.04 LTS.
12.04 was not entirely stable; something was crashing regularly, and the
Ubuntu tools make it hard for a user to determine what. The upgrade went
moderately well; I now get error messages during system startup (about
an unnamed file not being found) and a couple of other bits of
flakiness, but I counted it as a success and the system as functional.
This morning I tried to wake up my screen, and nothing much happened. I
then attempted to ssh to the ubuntu box from another system. This
requested my password almost instantly, as normal - but then nothing
else happened, and the connection eventually dropped.
I conclude that IP and TCP are functional, and it's possible for some
processes to respond, but not many. So it's not a complete kernel hang.
(In particular, I'm seeing evidence that it's getting beyond things done
at interrupt level.)
I don't have any debugging aids installed, so I don't believe I can get
a kernel crash dump, which is what I'd want if I were debugging this. I
*can* potentially retrieve and attach logs, but you'll have to tell me
which ones are relevant, and do so before they rollover. (Also, logging
will have to be functioning; IIRC, there were syslog issues in 12.04,
and while I'd implemented whatever fix was reccommended at the time, I
haven't looked at my logs since the upgrade.)
This is a desk top system originally from System 76 - i.e. built for
linux - that's also running a bunch of server software (postfix, apache,
...) I was not (knowingly) running anythign unusual at the time -
probably Unity, a few shells, firefox, maybe guncash and/or emacs - and
all the usual demons.
IIRC, I was not at the very latest versions of all software installed -
some new versions ahd come out since I upgraded, and I was going to deal
with installing them on the weekend.
I'm going to hard reboot the system now. I can then gather identifying
info. If I have time this AM before work, I'll check for standard things
you want in all bugs, and add them. (Right now I'm posting from my Mac
laptop ;-))
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1680502
Title:
Hang after upgrade to 16.04
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