I have the exact same problem on my IdeaPad 520s with an Geforce MX 940.
It happens everytime when I have an active Nvidia card (prime-select
nvidia). With prime-select intel the poweroff/reboot works fine.
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@Amr: Is your request to install the ubuntu-software package directed to
me? I don't get your point there. Why should I do this, if the gnome-
software already fixed this bug.
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@Lonnie: Yeah, I did this. This is the output:
OK:1 http://de.archive.ubuntu.com/ubuntu xenial InRelease
OK:2 http://de.archive.ubuntu.com/ubuntu xenial-updates InRelease
OK:3 http://de.archive.ubuntu.com/ubuntu xenial-backports InRelease
OK:4 http://de.archive.ubuntu.com
I activated the "xenial-proposed" (which is not in the updates tab, but
in the last tab. Don't know the english naming). I've installed the
update via:
$ sudo apt-get install gnome-software/xenial-proposed
After a reboot I was able to install "dropbox_2015.10.28_amd64.deb" and
"google-chrome-stab
