Very puzzling because I first I used the GUI without invoking it from a terminal. It worked for a while and then silently went away. Not even an oil slick.
When I invoked it from a terminal (sudo update-manager -d) it had this "Signal 0" message (which makes no sense to me since there is no signal 0 -- signals start at 1).
From there I learned that the proprietary nVidia driver was the trigger for the problem. I searched in vain for a GUI tool to switch back to Nouveau (there used to be one in Settings: Hardware, but no more -- pity!). I tried the canned apt-get commands but they didn't work.
What appears to be working is using the command "do-release-upgrade". Thanks to <https://launchpad.net/~ric-almeida> for mentioning this in 1203534
Unfortunately, because do-release-upgrade is working (as I type this), I cannot go back and capture precise information about the "sudo update-manager -d" failure.
I think I hit this too.
Very puzzling because I first I used the GUI without invoking it from a terminal. It worked for a while and then silently went away. Not even an oil slick.
When I invoked it from a terminal (sudo update-manager -d) it had this "Signal 0" message (which makes no sense to me since there is no signal 0 -- signals start at 1).
This was enough for me to google and get here. But no solution was presented here, so I went to <https:/ /bugs.launchpad .net/ubuntu/ +source/ ubuntu- release- upgrader/ +bug/1203534> (thanks Kelly).
From there I learned that the proprietary nVidia driver was the trigger for the problem. I searched in vain for a GUI tool to switch back to Nouveau (there used to be one in Settings: Hardware, but no more -- pity!). I tried the canned apt-get commands but they didn't work.
What appears to be working is using the command "do-release- upgrade" . Thanks to <https:/ /launchpad. net/~ric- almeida> for mentioning this in 1203534
Unfortunately, because do-release-upgrade is working (as I type this), I cannot go back and capture precise information about the "sudo update-manager -d" failure.