org.nemo.root.policy is only in nemo package, your problem seems caused by
unofficial package from webupd8 ppa.
Is not a problem of official packages that can't consider any unofficial
packages changes.
Remove all unofficial packages before install the official ones.
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You received this bug
** Changed in: nemo (Ubuntu)
Status: New = Invalid
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https://bugs.launchpad.net/bugs/1349004
Title:
package nemo 2.2.3-2 failed to install/upgrade: trying to overwrite
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1349004
Title:
package nemo 2.2.3-2 failed to install/upgrade: trying to overwrite