How to set the correct location?

Question

ubuntu

I check the "headless" browser through here, for example, through this site

https://hidemy.name/ru/ip/

shows me

Where are you from: Germany / St. Petersburg, Northwestern Federal District

The server itself is in Germany, but the fact that St. Petersburg is indicated there is not clear ...
It is quite possible that when setting up the server, this data was specified somewhere ...
Where can I see / change this data? how to make it show the correct location?
There is a suspicion that "some" site blocks the "headless" browser because of this data...
Also on the topic - what other parameters are there that can be adjusted that may affect the operation of the "headless" one?