Until this morning I had xubuntu 16.04 with kernel vers. 4.6.0 running without any problems on my Lenovo ThinkPad X1 (3rd generation). Because the system didn't stop nagging me to upgrade to 18.04 I did just that using the "software updater tool". I already did this some times, never with any problems at all.
After the release upgrade had finished and booting into the new kernel (4.15) the system seemed completely unresponsive. I couldn't click or do anything. But when I changed to
tty1 by hitting STRGALTF1 I saw the login prompt and after that the shell is continously spilled with
^@ symbols. When I hit some keys here, the symbols sometimes change for a time and I am not able to get back to
tty7 (where my desktop manager runs).
Now when I boot into the old kernel (4.6.0) I have the same behavior, and when I then go to
tty1 I get the
^@ again but at least I can change back to
tty7 and everything works "normal" … uuh well, sometimes I can't right-click things, sometimes things take unusually long, sometimes windows that I click don't get a focus and stuff like that. But at least it works, so I am able to post here.
During the release upgrade I was asked two times if I would keep the old configuration or if I want the maintainers version. That was with "unattended-upgrades" and "network-manager" and both times I hit "maintainers version" which I think might have resulted in this problem (not sure!).
I had a fully configured and running wwan interface with SIM card and everything which I had configured not to be enabled on start-up but only if I say so. This configuration has gone. To make sure that it isn't the wwan interface I installed
tlp and did
wwan off. This seems to have worked, but the strange behavior persists.
I also noticed that during the upgrade there where some warnings related to
light-dm but they were to fast to read them. Yet another thing that I noticed was that the
GRUB_CMDLINE_LINUX which I had to modify in some way a few years back when I installed the system was also gone, it is now only
GRUB_CMDLINE_LINUX="". I searched the well-known sites dealing with ubuntu on thinkpad (including this site) but found nothing helpful. I can't find any site dealing with this problem I have, e.g. when I search
"^@" google asks me to make sure that all words are written correctly.
To be clear, everything else seems to work, volume- and brightness keys, touchpad and so on, but only when I boot into kernel 4.6.0, open
tty1 and let the symbols roll and then change back to my GUI on
I'm not sure what to try next, has anyone maybe a clue? Right now I'm again not able to focus other windows (e.g. the terminal emulator), I can only do so with ALTTAB. When I started to write this post it still worked. I would be grateful to get some help!
Update I just tried a
sudo apt-get update && sudo apt-get dist-upgrade && sudo apt-get install -f
– to no avail.
I also did a
grep -ai "error" /var/log/syslog Jun 12 16:24:32 denkbrett lircd-0.10.0: Error: Cannot glob /sys/class/rc/rc0/input[0-9]*/event[0-9]*
I disabled lircd like this:
sudo systemctl stop lircd.socket lircd.service sudo systemctl disable lircd.socket lircd.service
Again, to no avail. I can't seem to find any other errors in the syslog. Am I missing something?