Same problem for me. Also my laptop is fine but the PC has this bug.
Using alt-tab to select update manager doesn't open the window either.
Even reinstalling update-manager didn't help. I used this procedure to
uninstall:
1.- sudo apt-get remove update-manager
2.- sudo rm -r /etc/update-manager
sudo rm -r /usr/share/update-manager
sudo rm -r /usr/lib/update-manager
sudo rm -r /var/lib/update-manager
sudo rm -r ~/.cache/update-manager-core
sudo rm -r ~/.gconf/apps/update-manager
3.- sudo apt-get install update-manager
The only workarround is to close the icon in the unity bar and start
update-manager from dash or the main menu.
Update-manager is version 1:0.156.14.4, as reported by "apt-cache policy
update-manager"
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https://bugs.launchpad.net/bugs/925260
Title:
Update Manager does not open, but the icon appears on the dash when
updates are available
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