Resolved Backup fails because list_admin.py has error

[mbarchfe]

Server operating system version

Ubuntu 20.04

Plesk version and microupdate number

18.0.57 #5

Hi,

since I upgraded Ubuntu from 18.04 to 20.04, I get the following error during backup:

Unable to back up mailing list <mailing list name>. Error: Failed to exec python: Exit code: 1: File "/opt/psa/PMM/list_admin.py", line 24 except getopt.error, msg:

It seems to be related to the python version. The default python version is now 3.8.

What python version am I supposed to set as default so that the plesk backup runs again?

thanks
Markus

 

[Peter Debik]

Could you please provide the content of these definitions from /etc/psa/psa.conf here:
PYTHON_BIN
MAILMAN_ROOT_D
MAILMAN_VAR_D

 

[mbarchfe]

sure.


# Mailman directories
MAILMAN_ROOT_D /usr/lib/mailman
MAILMAN_VAR_D /var/lib/mailman
PYTHON_BIN /usr/bin/python

and


root@vserver ~ # ls -l /usr/bin/python
lrwxrwxrwx 1 root root 7 Apr 15 2020 /usr/bin/python -> python3
root@vserver ~ # which python3
/usr/bin/python3
root@vserver ~ # ls -l /usr/bin/python3
lrwxrwxrwx 1 root root 9 Mar 13 2020 /usr/bin/python3 -> python3.8
root@vserver ~ # which python3.8
/usr/bin/python3.8
root@vserver ~ # ls -l /usr/bin/python3.8
-rwxr-xr-x 1 root root 5465880 Nov 22 11:22 /usr/bin/python3.8

 

[Peter Debik]

According to developers it should be /usr/bin/python2 (or a symbolic link to it), e.g.:

[root@host]# grep python /etc/psa/psa.conf
PYTHON_BIN /usr/bin/python
[root@host]# ll /usr/bin/python
lrwxrwxrwx 1 root root 7 Nov 17 09:49 /usr/bin/python -> python2*

I am not sure what the implications would be to install Python 2 and link to it. Did you ever uninstall it?

 

[Peter Debik]

Developers say, you should try to install Python 2, because that is required to backup mailman.

 

[mbarchfe]

Python2 was still installed on Ubuntu 20.04. I just had to change the link from /usr/lib/ptyhon to /usr/lib/python2.
Now the backup is running fine again.
Thanks