This issue impacted me as well on a fresh Ubuntu 18.04 install. I
encountered this when I attempted to install ubuntu-restricted-extras.
The work-around provided (sudo dpkg-reconfigure libdvd-pkg) corrected
the issue.
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** Also affects: network-manager-vpnc (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: network-manager-vpnc (Ubuntu)
** Package changed: network-manager (Ubuntu) = network-manager-vpnc
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Bugs,
*** This bug is a duplicate of bug 152855 ***
https://bugs.launchpad.net/bugs/152855
I am also experiencing this issue running a dual-monitor setup. I have
found two workarounds that may be clues to the origin of the issue:
1) CTRL-ALT_F1 to get to terminal then CTRL-ALT-F7 to return to x