Had successfully update and upgrade Ubuntu on WSL succesfully:
then I unregistered the 2 version of Ubuntu and installed one Ubuntu.Got following errors:
Tried ~$ grep -nvr "^#" /etc/apt/ | grep impish, and got the following info:
grep: /etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg: binary file matchesgrep: /etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg: binary file matchesAnyone could give hints? Thanks in advance!