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- Server operating system version
- Ubuntu 20.04.6 LTS
- Plesk version and microupdate number
- Version 18.0.51 Update #1
Now I'm seeing this error message every day. 
Reason: 2023-04-30 06:25:18 INFO: pum is called with arguments: ['--list', '--repo-info', '--json']
2023-04-30 06:25:20 ERROR: E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-6 focal Release' does not have a Release file., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-7 focal Release' does not have a Release file., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-8 focal Release' does not have a Release file.
2023-04-30 06:25:20 ERROR: Exited with returncode 1.
Reason: 2023-04-30 06:25:18 INFO: pum is called with arguments: ['--list', '--repo-info', '--json']
2023-04-30 06:25:20 ERROR: E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-6 focal Release' does not have a Release file., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-7 focal Release' does not have a Release file., W:Updating from such a repository can't be done securely, and is therefore disabled by default., W:See apt-secure(8) manpage for repository creation and user configuration details., E:The repository 'https://download.imunify360.com/ubuntu/20.04/slot-8 focal Release' does not have a Release file.
2023-04-30 06:25:20 ERROR: Exited with returncode 1.
