IMO this issue is fixed in newer Windows builds, I suggest upgrading your underlying Windows system to avoid having problems with case insensitivity of the file system.
Since the PAM man page is present for long years and capital letters in man names are not exactly rare I don't think this should be fixed based on just the presence of the capital letters: $ apt-file search man/man | grep '[A-Z]' | wc -l 46066 If there were only a few files present with both uppercase and lowercase names I'd lean towards fixing them, but there are ~3k file pairs in bionic: $ for i in $(apt-file search / | cut -d' ' -f2 | sort | uniq | tr '[:upper:]' '[:lower:]' | sort | uniq -c | grep -v '^ *1 ' | awk '{print $2}' ); do apt-file search -i $i; done firejail-profiles: /etc/firejail/Cryptocat.profile firejail-profiles: /etc/firejail/cryptocat.profile firejail-profiles: /etc/firejail/Cyberfox.profile firejail-profiles: /etc/firejail/cyberfox.profile firejail-profiles: /etc/firejail/FossaMail.profile ... It is not feasible to fix all of them in Ubuntu, maybe the ones in main but IMO one should update Windows to make it support case sensitive operation. ** Changed in: pam (Ubuntu) Status: Incomplete => Won't Fix -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pam in Ubuntu. https://bugs.launchpad.net/bugs/1786821 Title: pam.7.gz is a symlink to PAM.7.gz . This does not work for caseinsensitive filesystems e.g. Windows Subsystem for Linux Status in pam package in Ubuntu: Won't Fix Bug description: The package libpam-runtime contains a symlink pam.7.gz -> PAM.7.gz in ./usr/share/man/man7 and this doesn't work in Windows Subsystem for Linux since Windows has a caseinsensitive filesystem. On ubuntu 18.04 this PAM.7.gz exists too. I know it's not a linux centric issue. But why libpam-runtime is using Uppercase and symlinks anyway? Other packgages in man7 just use lowercase, and this is what I'm expecting. Hopefully you can fix it. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pam/+bug/1786821/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp