This bug has been also reported elsewhere. See here, for instance:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1761121
Marked the other link as duplicate of this.
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*** This bug is a duplicate of bug 1759920 ***
https://bugs.launchpad.net/bugs/1759920
** This bug has been marked a duplicate of bug 1759920
intel-microcode 3.20180312.0 causes lockup at login screen(w/
linux-image-4.13.0-37-generic)
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Public bug reported:
package libgtk-3-common 3.18.9-1ubuntu3.2 failed to install/upgrade:
package libgtk-3-common is already installed and configured
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libgtk-3-common 3.18.9-1ubuntu3.2
ProcVersionSignature: Ubuntu 4.4.0-62.83-generic
Public bug reported:
error while upgrading: package libgtk-3-common 3.18.9-1ubuntu3.2 failed
to install/upgrade: package libgtk-3-common is already installed and
configured
ProblemType: Package
DistroRelease: Ubuntu 16.04
Package: libgtk-3-common 3.18.9-1ubuntu3.2
ProcVersionSignature: Ubuntu
