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Issue There was an issue with updating system packages and third-party components. pum is called with arguments: ['--list', '--repo-info', '--json']

PeopleInside

Regular Pleskian
Server operating system version
Ubuntu 22.04.5 LTS
Plesk version and microupdate number
18.0.71 Update 2
Hi, I hope this message finds you well.
Since different days I'm getting an email from Plesk that indicate issues on updating third-party components.
The email say:

There was an issue with updating system packages and third-party components
Reason: 2025-08-02 06:26:21 INFO: pum is called with arguments: ['--list', '--repo-info', '--json']
2025-08-02 06:26:59 ERROR: Apt cache fetch failed. Try to run the `apt-get update` command.
2025-08-02 06:26:59 ERROR:
2025-08-02 06:26:59 ERROR: Exited with returncode 1.
I searched on the Internet for a solution but I was unable to fix and find a solution.
Could you please help me?

IF I run
Code:
apt-get update
by SSH I don't get any error.
Thank you in advance!
 
The error can be reproduced using the command:
Code:
/usr/local/psa/admin/sbin/pum --list --repo-info --json
Result:
Code:
2025-08-02 11:00:20 INFO: pum is called with arguments: ['--list', '--repo-info', '--json']
2025-08-02 11:00:20 ERROR: Update operation was locked by another update process (Plesk installer or pum).
2025-08-02 11:00:20 ERROR: Exited with returncode 100.
 
After this error I run:
Code:
ps aux | grep -E 'pum|plesk'
to check if some process was locking the update.

AI helped to understand the result and no process was locking the update.

I checked also for zombie process

Code:
sudo lsof /var/lib/dpkg/lock-frontend
sudo lsof /var/lib/apt/lists/lock
sudo lsof /var/cache/apt/archives/lock
sudo lsof /opt/psa/var/modules/pum/pum.lock

but everything was fine.

Now running
Code:
/usr/local/psa/admin/sbin/pum --list --repo-info --json
it gives a long Json output so everything seems is working fine but is since 4 days I get error email every morning.

Maybe something in the way update work should be improved checking for locking process and retry as soon process are not locked or better management of scheduled process. I hope this issue never happen again in tomorrow morning and I hope Plesk can maybe improve this.

I can read about other users that has reported the same issue and was not finding any solution.
 
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