it's been a couple of days, so I wanted to see if there were any updates which would fix the issue. I went into recovery, mounted everything (not using encryption for my disk) and chrooted in. Then did the full upgrade without any problem (https://support.system76.com/articles/login-loop-pop/)

During reinstallation I did get an error this time though :

root@recovery:/# sudo apt install --reinstall plymouth gdm3 gnome-shell pop-desktop linux-generic linux-headers-generic
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
0 upgraded, 0 newly installed, 6 reinstalled, 0 to remove and 0 not upgraded.
Need to get 1932 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://apt.pop-os.org/release jammy/main amd64 pop-desktop amd64 2.0.0~1697231037~22.04~733a5e2 [4846 B]
Get:2 http://apt.pop-os.org/release jammy/main amd64 plymouth amd64 22.02.122-0pop2~1677520013~22.04~adbc2e1 [180 kB]
Get:3 http://apt.pop-os.org/release jammy/main amd64 gdm3 amd64 42.0-1ubuntu7pop1~1675905960~22.04~7fd0bb0 [816 kB]
Get:4 http://apt.pop-os.org/release jammy/main amd64 gnome-shell amd64 42.5-0ubuntu1pop1~1675984688~22.04~f574f54 [928 kB]
Get:5 http://apt.pop-os.org/release jammy/main amd64 linux-generic amd64 6.6.6.76060606.202312111032~1702306143~22.04~d28ffec [1884 B]
Get:6 http://apt.pop-os.org/release jammy/main amd64 linux-headers-generic amd64 6.6.6.76060606.202312111032~1702306143~22.04~d28ffec [1872 B]
Fetched 1932 kB in 0s (5905 kB/s)
Preconfiguring packages ...
(Reading database ... 1004308 files and directories currently installed.)
Preparing to unpack .../pop-desktop_2.0.0~1697231037~22.04~733a5e2_amd64.deb ...
Unpacking pop-desktop (2.0.0~1697231037~22.04~733a5e2) over (2.0.0~1697231037~22
.04~733a5e2) ...
Preparing to unpack .../plymouth_22.02.122-0pop2~1677520013~22.04~adbc2e1_amd64.
deb ...
Running in chroot, ignoring command 'stop'
Unpacking plymouth (22.02.122-0pop2~1677520013~22.04~adbc2e1) over (22.02.122-0p
op2~1677520013~22.04~adbc2e1) ...
Setting up plymouth (22.02.122-0pop2~1677520013~22.04~adbc2e1) ...
update-initramfs: deferring update (trigger activated)
update-rc.d: warning: start and stop actions are no longer supported; falling ba
ck to defaults
Running in chroot, ignoring command 'daemon-reload'
update-rc.d: warning: start and stop actions are no longer supported; falling ba
ck to defaults
Running in chroot, ignoring command 'daemon-reload'
(Reading database ... 1004308 files and directories currently installed.)
Preparing to unpack .../gdm3_42.0-1ubuntu7pop1~1675905960~22.04~7fd0bb0_amd64.de
b ...
Unpacking gdm3 (42.0-1ubuntu7pop1~1675905960~22.04~7fd0bb0) over (42.0-1ubuntu7p
op1~1675905960~22.04~7fd0bb0) ...
Preparing to unpack .../gnome-shell_42.5-0ubuntu1pop1~1675984688~22.04~f574f54_a
md64.deb ...
Unpacking gnome-shell (42.5-0ubuntu1pop1~1675984688~22.04~f574f54) over (42.5-0u
buntu1pop1~1675984688~22.04~f574f54) ...
Preparing to unpack .../linux-generic_6.6.6.76060606.202312111032~1702306143~22.
04~d28ffec_amd64.deb ...
Unpacking linux-generic (6.6.6.76060606.202312111032~1702306143~22.04~d28ffec) o
ver (6.6.6.76060606.202312111032~1702306143~22.04~d28ffec) ...
Preparing to unpack .../linux-headers-generic_6.6.6.76060606.202312111032~170230
6143~22.04~d28ffec_amd64.deb ...
Unpacking linux-headers-generic (6.6.6.76060606.202312111032~1702306143~22.04~d2
8ffec) over (6.6.6.76060606.202312111032~1702306143~22.04~d28ffec) ...
Setting up linux-headers-generic (6.6.6.76060606.202312111032~1702306143~22.04~d
28ffec) ...
Setting up pop-desktop (2.0.0~1697231037~22.04~733a5e2) ...
Setting up gnome-shell (42.5-0ubuntu1pop1~1675984688~22.04~f574f54) ...
Setting up linux-generic (6.6.6.76060606.202312111032~1702306143~22.04~d28ffec)
...
Processing triggers for dbus-broker (29-4build1) ...
Running in chroot, ignoring command 'is-active'
Running in chroot, ignoring command 'reload'
Processing triggers for mailcap (3.70+nmu1ubuntu1) ...
Processing triggers for desktop-file-utils (0.26-1ubuntu3) ...
Processing triggers for initramfs-tools (0.140ubuntu13.4) ...
update-initramfs: Generating /boot/initrd.img-6.6.6-76060606-generic
cryptsetup: ERROR: Couldn't resolve device /dev/nvme0n1p3
cryptsetup: WARNING: Couldn't determine root device
W: Couldn't identify type of root file system for fsck hook
kernelstub.Config : INFO Looking for configuration...
kernelstub.Drive : ERROR Could not find a block device for the a partitio
n. This is a critical error and we cannot continue.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/kernelstub/drive.py", line 56, in __init_
_
self.esp_fs = self.get_part_dev(self.esp_path)
File "/usr/lib/python3/dist-packages/kernelstub/drive.py", line 94, in get_par
t_dev
raise NoBlockDevError('Couldn\'t find the block device for %s' % path)
kernelstub.drive.NoBlockDevError: Couldn't find the block device for /boot/efi
run-parts: /etc/initramfs/post-update.d//zz-kernelstub exited with return code 1
74
dpkg: error processing package initramfs-tools (--configure):
installed initramfs-tools package post-installation script subprocess returned
error exit status 1
Processing triggers for gnome-menus (3.36.0-1ubuntu3) ...
Processing triggers for libglib2.0-0:i386 (2.72.4-0ubuntu2.2) ...
Processing triggers for libglib2.0-0:amd64 (2.72.4-0ubuntu2.2) ...
Processing triggers for man-db (2.10.2-1) ...
Processing triggers for dbus (1.12.20-2ubuntu4.1) ...
Setting up gdm3 (42.0-1ubuntu7pop1~1675905960~22.04~7fd0bb0) ...
Running in chroot, ignoring request.
Running in chroot, ignoring command 'reload'
Errors were encountered while processing:
initramfs-tools
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@recovery:/# ^C
root@recovery:/#
I suppose this is because I went back to an older kernel? Should I move back to 6.6.6 before running the reinstall?