Right after getting kali linux on windows WSL, from windows store, i tried to upgrade it as follow
sudo apt-get update && sudo apt full-upgrade -y
# log, log, log...
Unpacking libc6:amd64 (2.38-10) over (2.37-12) ...
Setting up libc6:amd64 (2.38-10) ...
Checking for services that may need to be restarted...
Checking init scripts...
Nothing to restart.
[001% #>----------------------]
The upgrade seems stuck at the "Nothing to restart" output.
As mentionned here : microsoft/WSL#11092 (comment), directories /run/systemd/system do not exist and block the upgrade. You can do this action during the blocked upgrade, from another terminal.
sudo mkdir -p /run/systemd/system