Hi, @RafalGorecki
I have resolved the issue of sudo apt update failing by following the methods suggested in the article provided below.
However, after that, when I execute gedit ~/.bashrc , I encounter the following error, as shown in the image.

curl https://install.husarnet.com/repo.key | sudo apt-key add -is worked properly.

However, I continue to encounter warning messages when executinggedit ~/.bashrc.
