Plesk for Linux update or upgrade fails on server with Ubuntu OS: Fatal, conflicts violated plesk-control-panel:amd64

Symptoms

Note: The article is applicable only to Plesk servers with Ubuntu operating system.

• Plesk update or upgrade fails with one of the following errors:

  CONFIG_TEXT: E: Fatal, conflicts violated plesk-control-panel:amd64

  OR

  CONFIG_TEXT: The following components will be removed because they conflict with the components you selected to install or require the components you selected to remove:ModSecurity (modsecurity)
  Installing packages
  E: dpkg was interrupted, you must manually run 'dpkg --configure -a' to correct the problem.

• No CSS or JS files are loaded on the Plesk login page with the below error in the log file /var/log/sw-cp-server/error_log:

  CONFIG_TEXT: [error] 985#0: *3 open() "/opt/psa/admin/htdocs/cp/theme/css/main.css" failed (2: No such file or directory), client: 203.0.113.2, server: , request: "GET /cp/theme/css/main.css?1581674967 HTTP/1.1", host: "203.0.113.3:8443", referrer: "https://203.0.113.3:8443/login_up.php"
  [error] 20525#0: *3 open() "/opt/psa/admin/htdocs/cp/javascript/main.js" failed (2: No such file or directory), client: 203.0.113.2, server: , request: "GET /cp/javascript/main.js?1581674967 HTTP/1.1", host: "203.0.113.3:8443", referrer: "https://203.0.113.3:8443/login_up.php"
  [error] 20525#0: *18 open() "/opt/psa/admin/htdocs/ui-library/plesk-ui-library.min.js" failed (2: No such file or directory)

• There are a number of not configured Plesk packages:

  # dpkg -l | grep -v "ii" | egrep "plesk|psa" | wc -l
  43

• The command dpkg --configure -a stucks at the step Setting up plesk-dovecot-imap-driver:

  # dpkg --configure -a
  Setting up psa-locale-base-en-us (17.8.11-ubuntu16.04.build1708181211.16) ...
  Setting up libgs9-common (9.26~dfsg+0-0ubuntu0.16.04.12) ...
  Setting up cloud-guest-utils (0.27-0ubuntu25.1) ...
  Setting up plesk-php70 (7.0.33-ubuntu16.04.18120713) ...
  Setting up plesk-dovecot-imap-driver (17.8.11-ubuntu16.04.build1708190903.21)

  In the process tree, it can be seen that the process is stuck at the command /usr/bin/python3 /usr/sbin/aa-status --enabled:

  # ps -ef ww
  21390 pts/2 S+ 0:00 | \_ dpkg --configure -a
  21396 pts/2 S+ 0:00 | \_ /bin/bash -hB /var/lib/dpkg/info/plesk-dovecot-imap-driver.postinst configure 17.8.11-ubuntu16.04.build1708180920.18
  21423 pts/2 S+ 0:00 | \_ /bin/bash -hB /var/lib/dpkg/info/plesk-dovecot-imap-driver.postinst configure 17.8.11-ubuntu16.04.build1708180920.18
  21434 pts/2 D+ 0:00 | \_ /usr/bin/python3 /usr/sbin/aa-status --enabled

Cause

Update stucks on the AppArmor-related operation.

Resolution

1. Connect to the server using SSH.

2. Reboot the server:

   # reboot

3. After the reboot, connect to the server using SSH again and finish the configuration of the unconfigured packages:

   # dpkg --configure -a

4. Complete the previously failed operation:

   • Plesk Onyx - update or upgrade.
   • Plesk Obsidian update.