mintupdate software sources doesnt work after update 18.2 -> 18.3

[eiver]

Hi all,

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[1607]: superadmin: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/home/superadmin] [COMMAND=/usr/lib/linuxmint/mintSources/mintSources.py]

Everything else works ok. I can click "Install Updates" and I do get the root password prompt. What is weird, I have another machine, where I installed Mint 18.3 from scratch and it doesn't have that issue.

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.

[Flemur]

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Jun 21 18:21:03 eiverserver pkexec[1607]: superadmin: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/home/superadmin] [COMMAND=/usr/lib/linuxmint/mintSources/mintSources.py]

pkexec is an example of the convoluted stuff from freedesktop.org that'll come with Mint 19 to replace the things that already work perfectly well, namely:

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gksudo /usr/lib/linuxmint/mintSources/mintSources.py

Is your username "superadmin"?

[eiver]

Yes it is .

I reduced the problem to a single command:

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~ $ software-sources

(Notice no sudo here). On the machine with LM 18.3 installed from scratch, this command creates a popup window asking for credentials.

However on the machine LM 18.3, which was upgraded from 18.2, I get this:

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 ~ $ software-sources 
Error executing command as another user: Not authorized

This incident has been reported.

How can I fix that?

[MmUser]

Problem was fixed with the update yesterday.