[BUG] GUI fails to start if the disk is full

[kexD]

Distribution (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="22.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 22.04 LTS"
VERSION_ID="22.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=jammy
UBUNTU_CODENAME=jammy
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy $PACKAGE NAME):
N/A

Issue/Bug Description:
Problem has started with the system UI freezing. Restarting the OS lead to it not booting in GUI mode after disc decryption. Upon investigation using TTY I found the encrypted disk being full using df. Freeing up some space and rebooting led to successful boot into GUI

Steps to reproduce (if you know):
Have not tested those, just an assumption

1. Fill the disk to the brim
2. Let it freeze (for me it was after starting PIA VPN daemon)
3. Reboot
4. Enter disc decryption password
5. Proceed to see black screen with no output

Expected behavior:
I would expect a warning message from the system upon approaching critical disk usage threshold.

Other Notes:
N/A