It looks like you've manually installed the unity package and the
release upgrade process wants to remove it since you are using lubuntu.
2015-11-11 20:35:15,247 DEBUG Marking 'lubuntu-core' for upgrade
2015-11-11 20:35:16,235 DEBUG blacklist expr 'unity$' matches 'unity'
2015-11-11 20:35:16,236 DEBUG The package 'unity' is marked for removal but
it's in the removal blacklist
2015-11-11 20:35:45,261 ERROR Dist-upgrade failed: 'Das Paket »unity« ist zum
Löschen vorgesehen, wurde aber durch das System gesperrt.'
2015-11-11 20:35:45,262 DEBUG abort called
If you uninstall unity the upgrade should proceed fine.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1515378
Title:
Tried to upgrade to 15.10, failed
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