Issue Error E: Conflicting values set for option Signed-By regarding source http://autoinstall.plesk.com/PMM_1.0.0/

[theunknownstuntman]

Server operating system version

20.04.6 LTS (Focal Fossa)

Plesk version and microupdate number

Version 18.0.67 Update #2

Hi all,

since today I receive the following error message, when I run, for example, the command "apt list exim". As I did not modify anything on the server
in the last days and no changes where applied as part of "unattended-upgrades", I am a bit clueless, where this error comes from and how to fix it, as I don't want to mess with keys related to plesk repositories.

Unfortunately this link is no help.

https://support.plesk.com/hc/en-us/articles/14324248261911-Can-t-open-Plesk-updates-Conflicting-values-set-for-option-Signed-By-regarding-source

I use Plesk Obsidian Web Host Edition.

I appreciate any help. Thanks.

E: Conflicting values set for option Signed-By regarding source Index of /PMM_1.0.0 focal: /etc/apt/keyrings/plesk-ext-panel-migrator.gpg != /etc/apt/keyrings/plesk-ext-site-import.gpg
E: The list of sources could not be read.
E: Conflicting values set for option Signed-By regarding source Index of /PMM_1.0.0 focal: /etc/apt/keyrings/plesk-ext-panel-migrator.gpg != /etc/apt/keyrings/plesk-ext-site-import.gpg
E: The list of sources could not be read.

 

[theunknownstuntman]

I thought I could fix the issue by updating Plesk to Version 18.0.67 Update #3. Unfortunately I can not open https://plesk.server.domain:8447, when I open Tools & Settings, "Updates" in Plesk

 

[scsa20]

Look for any additional sources in /etc/apt/sources.list.d, chances are have a duplicate source there.

Also if you want to try to upgrade your plesk installation you can run of the following command depending on if you want to upgrade everything or just the panel.

Everything:

plesk installer --select-release-latest --upgrade-installed-components

Just Plesk:

plesk installer install-panel-updates