I just upgraded my Lubuntu 16.04 to 17.04. But after the upgrade, update-manager doesn't show any more.
I've tried update-manager, update-manager -v, and update-manager --help from the command line. But the commands just return immediately without showing the GUI or giving any output.
Has anyone had similar experience or know of a solution?
--Update --
It seems that the problem is more than update-manager. When I launch Startup Disk Creator, Synaptic Package Manager from System Tools, the same thing happens. The mouse cursor turns into a wait/busy cursor for some seconds, and then silence. But Task Manager works as usual.
As suggested by the comments, the output of dpkg -l and ls -l are below:
$ dpkg -l | grep update-manager
ii python3-update-manager 1:17.04.8 all python 3.x module for update-manager
ii update-manager 1:17.04.8 all GNOME application that manages apt updates
ii update-manager-core 1:17.04.8 all manage release upgrades
$ ls -l /usr/bin/update-manager
-rwxr-xr-x 1 root root 4793 Sep 20 16:36 /usr/bin/update-manager
