I have the same thread on the same topic but it was related to Linux Mint 20. So I try Ubuntu 20.04 LTS on my laptop and fortunately snap is working well. So I installed Ubuntu 20.04 LTS on my desktop after a long hassle but again I receive the same error (unable to contact snap store). I think there is a problem with my desktop installation so I was wondering if you could provide any solution.
Thanks in advance for your time.