I have the following issue. After upgrading from Mint Mate 18.2 to 18.3, if I click mintupdate->Edit->Software Sources, the window doesn't show up. Instead I see the following in auth.log:
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Jun 21 18:21:03 eiverserver pkexec: superadmin: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/home/superadmin] [COMMAND=/usr/lib/linuxmint/mintSources/mintSources.py]
I did check the /etc/apt/sources.list.d/official-package-repositories.list and it looks the same on both machines.
I did find a number of other threads (some of them are 3+ years old), but none of them helped me.
I don't know, if it is relevant, but I also noticed that all my Favorites in mintmenu are gone.