Thanks everyone for the help, the issue is with auth.json, it was empty, seems like it can’t able to set up the token automatically.
I’ve to download it from “meshery-ui” as mentioned by @Abhi, & replace it with the auth.json file in the .meshery folder, finally, the result is as follows:
aminos@pop-os:~$ mesheryctl system login
✔ Meshery
Initiating login...
successfully authenticated
