Because /usr/share/pam-configs/mkhomedir specifies "Priority: 0", if you
enable it using `sudo pam-auth-update` pam_mkhomedir.so will become the
last module listed in /etc/pam.d/common-session, meaning it will run after
all other enabled modules.

This can cause problems if any of the other session modules assume that
the home directory already exists. Even worse, if another session module
recursively creates a directory in the home directory it needs,
pam_mkhomedir.so will believe that the home directory was set up already,
and no files will be copied from the skeleton directory.

In my case I hit the problem with libpam-mount, which has "Priority: 128",
so changing /usr/share/pam-configs/mkhomedir to anything above that would
solve the issue for me. However, after looking at the "Priority" field of
all pam-configs with "Session-Type: Additional" in Debian [1] I found that
the module with the highest priority which should propably run after
mkhomedir is libpam-script with "Priority: 257"...

I also found that "plinth" include /usr/share/pam-configs/mkhomedir-freedombox
with "Priority: 900". Maybe that is a suitable priority for mkhomedir as well.


[1]:
libpam-afs-session: /usr/share/pam-configs/afs-session
    Priority: 64
libpam-cgfs: /usr/share/pam-configs/cgfs
    Priority: 0
libpam-cgm: /usr/share/pam-configs/cgm
    Priority: 0
libpam-ck-connector: /usr/share/pam-configs/consolekit
    Priority: 0
ecryptfs-utils: /usr/share/pam-configs/ecryptfs-utils
    Priority: 0
debian-edu-config: /usr/share/pam-configs/edu-umask
    Priority: 0
libpam-fscrypt: /usr/share/pam-configs/fscrypt
    Priority: 0
libpam-heimdal: /usr/share/pam-configs/krb5
    Priority: 704
libpam-krb5: /usr/share/pam-configs/krb5
    Priority: 704
libpam-ldap: /usr/share/pam-configs/ldap
    Priority: 128
libpam-ldapd: /usr/share/pam-configs/ldap
    Priority: 128
libpam-mount: /usr/share/pam-configs/libpam-mount
    Priority: 128
libpam-modules: /usr/share/pam-configs/mkhomedir
    Priority: 0
plinth: /usr/share/pam-configs/mkhomedir-freedombox
    Priority: 900
libpam-mklocaluser: /usr/share/pam-configs/mklocaluser
    Priority: 0
libpam-script: /usr/share/pam-configs/pam_script
    Priority: 257
libpam-snapper: /usr/share/pam-configs/snapper
    Priority: 0
libpam-ssh: /usr/share/pam-configs/ssh
    Priority: 64
libpam-sss: /usr/share/pam-configs/sss
    Priority: 128
libpam-systemd: /usr/share/pam-configs/systemd
    Priority: 0
libpam-tacplus: /usr/share/pam-configs/tacplus
    Priority: 257
libpam-tmpdir: /usr/share/pam-configs/tmpdir
    Priority: 0
libpam-runtime: /usr/share/pam-configs/unix
    Priority: 256
libpam-winbind: /usr/share/pam-configs/winbind
    Priority: 192