Plesk

Debian/Ubuntu system update on a Plesk server shows a warning: Duplicate sources.list entry

Symptoms

Cause

This is a Plesk bug with ID PPPM-6049 that is planned to be fixed in future updates.

Resolution

Until the issue is permanently fixed, the warning can be safely ignored.

Nevertheless, the following workaround can be performed to get rid of the warning:

workaround

  1. Connect to the server via SSH;

  2. Edit file /etc/apt/sources.list*;

  3. Comment out any repository line from this file with a "#" character containing any of the following words:

    PSA_
    PMM_
    SITEBUILDER_

    For example:

    # grep -r "PMM_" /etc/apt/sources.list*
    #deb [arch=amd64] http://autoinstall.plesk.com/debian/PMM_0.1.10 wheezy all

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