I'm not sure whether the problem has anything to do with computer-janitor 
(which, by the way, I can't really recommend...) or with an incomplete update 
and some problems with your packages.
In a terminal, could you try:
sudo apt-get clean
sudo apt-get update
sudo apt-get upgrade

And if you do get any warnings about conflicts, unmet dependencies etc.:
sudo apt-get -f install

-- 
Computer Janitor gives misleading error message "close other package managers" 
when none are running
https://bugs.launchpad.net/bugs/657198
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