>From VarLogDistupgradeMainlog.txt:
2018-09-20 10:10:57,848 DEBUG Marking 'lubuntu-core' for upgrade
2018-09-20 10:10:58,097 DEBUG blacklist expr 'update-manager$' matches
'update-manager'
2018-09-20 10:10:58,097 DEBUG The package 'update-manager' is marked for
removal but it's in the removal bl
** Tags added: xenial2bionic
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https://bugs.launchpad.net/bugs/1793469
Title:
The system can not be upgraded to version 18.04.1
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