Grafana - Conflicting Values set Error

You're getting this error because your system has conflicting Signed-By values for the same APT source (https://apt.grafana.com). That means two different keyring files are being referenced in your Grafana APT source entries.

E: Conflicting values set for option Signed-By regarding source https://apt.grafana.com/ stable: /etc/apt/keyrings/grafana.gpg != /usr/share/keyrings/grafana.key E: The list of sources could not be read.

You’ll usually see this error under Software Updates tab in Debian Control Panel.
Also you’ll see this error when running :

ggrock-linux-configurator

How to Fix the Issue
Step 1: Locate the conflicting APT entries
Run the following to find where https://apt.grafana.com is defined:

bash


grep -r "https://apt.grafana.com" /etc/apt/

You’ll likely see multiple files like:

swift


/etc/apt/sources.list.d/grafana.list
/etc/apt/sources.list

Check if any of those entries have signed-by=/etc/apt/keyrings/grafana.gpg and another has signed-by=/usr/share/keyrings/grafana.key.

Step 2:
Remove the extra keyring files leaving only sources.list

Step 3:

Another run of the search command should return only 1 entry from /etc/apt for grafana:

root@ggrock:~# grep -r "https://apt.grafana.com" /etc/apt
/etc/apt/sources.list:deb [signed-by=/etc/apt/keyrings/grafana.gpg] https://apt.grafana.com stable main