Can Not Update/Upgrade After Unregistered 2 versions' Ubuntu and Installed one Ubuntu as WSL

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 matches

Anyone could give hints? Thanks in advance!