This is a conflict between the official repo and a PPA you're using.
** Changed in: shimmer-themes (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/1243753
Title:
** Tags removed: need-duplicate-check
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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1243753
Title:
package shimmer-themes 1.6.2-0ubuntu2 failed to install/upgrade:
trying to overwrite
