google only finds a bunch of bug reports for "failed to install/upgrade:
trying to overwrite shared" but no explanation.
bug 1533780
bug 1574351
bug 1279192
bug 1490282
bug 1290155
bug 1464735
bug 1471677
bug 1193243
Could be an issue of a missing "Replaces"-declaration somewhere.
Possibly relate
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1490282
Title:
package libqtwebkit4 2.3.2-0ubuntu7 failed to install/upgrade: trying
to overwrite shared '/usr/s
