Lightdm (gdm) is the login manager for linux ubuntu and mint (by default)

If you need setup and cleanup that is ONLY done at lightdm login/logout then
one can run a script to setup and cleanup the session by 

running the loginout-install script, requires sudo

`module_load loginout-install; loginout_install <user>`  # default is current user

after loading common scripts this will ask if you want to add the .session folder for the user

or if you just need to add a user .session folder afterward

`module_load loginout-install; add_user_session <user>` 


the script does this

in `/etc/lightdm/lightdm.conf.d`  adds a file `50-setup-cleanup.conf`

```
[Seat:*]
session-cleanup-script=/opt/scripts/lightdm-cleanup.sh
session-setup-script=/opt/scripts/lightdm-setup.sh
```

in /opt/scripts put two files below and make sure they are +x executable

```
#!/bin/bash
#lightdm-setup.sh
echo "setup for ${USER}:${HOME} $(date)" >> /opt/scripts/lightdm.log
log=${HOME}/.session.log
if [[ -e $HOME/.session_login ]]; then su -c "/bin/bash $HOME/.session_login 1>>${log} 2>>${log} || true" $USER; fi
```

```
#!/bin/bash
#lightdm-cleanup.sh
echo "cleanup for ${USER}:${HOME} $(date)" >> /opt/scripts/lightdm.log
log=${HOME}/.session.log
if [[ -e $HOME/.session_logout ]]; then su -c "/bin/bash $HOME/.session_logout 1>>${log} 2>>${log} || true" $USER; fi
```

then in the user home puts
`.session_login`  and `.session_logout` files both executable
in those you can do anything like bindfs and fusermount -u 

make sure you restart lightdm or reboot
`sdr lightdm`