pmos stable sxmo installer images not working on pinephone: read-only filesystem

Describe your issue

What's the current behaviour?

The system installed by the installer (installer runs fine) does not work due to a read-only filesystem error. Console reports:

Cannot create directory /home/user/.local -- read only file system

Consequently, sway does not start.

What's the expected behaviour?

A working system 😄

How to reproduce your issue?

Use the latest pmos stable installer (with sxmo) to install to either eMMC or SD, either with or without encryption. Problem reproduces every time.

What device are you using?

pine64-pinephone (v1.2)

On what postmarketOS version did you encounter the issue?

• edge (master branch)

• v23.06

• v22.12 (Supported until 2023-07-06)

• I confirm that the issue still is present after running sudo apk upgrade -a

  • Unable to run due to non-working system

On what environment did you encounter the issue?

Environments

• GNOME Shell on Mobile
• Phosh
• Plasma Mobile
• Sxmo (Wayland/Sway) Please post the output of sxmo_version.sh
• Other: Please fill out
• [ ]

How did you get postmarketOS image?

• from https://images.postmarketos.org
• I built it using pmbootstrap
• It was preinstalled on my device

What's the build date of the image? (in yyyy-mm-dd format)

2023-08-14, but problem also occurs on 2023-08-07, didn't try any older ones Another user also reported this on reddit with 2023-07-24: https://www.reddit.com/r/pinephone/comments/15arr2o/readonly_file_system_sxmo/

Additional information

A suggestion solution on Reddit was:

I had the same problem and I fixed it by putting the correct UUID's in /etc/fstab.

I used blkid values on /dev/mmcblk2p1 and p2 for boot and / respectively. 

I tried that (booted a normal pmos image without installer and mounted the eMMC); the UUIDs in /etc/fstab were indeed not matching the ones reported by lsblk/blkid, and that indded resolved the issue.

Values in fstab:

/mnt/root/etc # cat fstab
# <file system> <mount point> <type> <options> <dump> <pass>
UUID=a26fec84-3388-4e71-88eb-ed80d23a1d4a / ext4 defaults 0 0
UUID=137cac60-d064-42c5-ab2a-0d3cabc6c7e1 /boot ext2 defaults 0 0

Expected values:

/mnt/root/etc # lsblk -o +UUID
NAME         MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINTS UUID
mmcblk2      179:32   0 29.1G  0 disk              
├─mmcblk2p1  179:33   0  243M  0 part  /mnt/boot   e38e9629-4c10-41dc-a566-7127915a3a1c
└─mmcblk2p2  179:34   0 28.9G  0 part              53416220-0086-4b4a-8d0e-fdbbbeebe253
  └─root     254:0    0 28.9G  0 crypt /mnt/root   6e279841-cb67-436a-a3fd-62746c5b8fee
mmcblk2boot0 179:64   0    4M  1 disk              
mmcblk2boot1 179:96   0    4M  1 disk              
zram0        253:0    0  1.5G  0 disk  [SWAP]      d818e29d-5e22-41a9-9372-5bf1adca035b