I'm on Ubuntu 16.04.1 (Gnome) and experienced this problem. Solved with:
sudo apt-get upgrade gnome-software
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https://bugs.launchpad.net/bugs/1647187
Title:
gnome-software crashed
First I tried: `sudo chown -R /sbin/plymouthd` but it didn't help. Then
I tried `sudo dpkg-reconfigure Plymouth` (reported above from brett) and
that worked!
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