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judex_gauss

Member

Registered: 2024-09-14

Posts: 8

[Solved] Cannot copy file in /usr/share/plymouth/themes: Read-only FS

For example when i try

sudo touch /usr/share/plymouth/themes/test

Output:

touch: cannot touch '/usr/share/plymouth/themes/test': Read-only file system

I ran

cat /etc/fstab

Output is

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /               btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=256,subvol=/@root     0 0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /home           btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=257,subvol=/@home     0 0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /srv            btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=259,subvol=/@srv      0 0

# /dev/nvme0n1p2
# UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44     /tmp            btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=261,subvol=/@tmp      0 0
tmpfs   /tmp         tmpfs   rw,nodev,nosuid,size=2G          0  0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /opt            btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=260,subvol=/@opt      0 0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /.snapshots     btrfs           rw,noatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=263,subvol=/@.snapshots       0 0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /swap           btrfs           rw,relatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=262,subvol=/@swap    0 0

# /dev/nvme0n1p2
UUID=d3a5eadd-16fb-4705-ac7d-f2379eec6c44       /var            btrfs           rw,relatime,compress=lzo,ssd,discard=async,space_cache=v2,subvolid=258,subvol=/@var     0 0

# /dev/nvme0n1p1
UUID=98B9-3C58          /boot           vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro   0 2

/swap/swapfile none swap defaults 0 0

As you can see, there are `rw` mount options so i'm clueless now.
Earlier there wasn't such problem with `Read-only file system`. Perhaps the problem appeared after i booted into btrfs snapshot, but it's not certain.

Last edited by judex_gauss (Yesterday 12:26:27)

judex_gauss

Member

Registered: 2024-09-14

Posts: 8

Re: [Solved] Cannot copy file in /usr/share/plymouth/themes: Read-only FS

Marking problem as solved:
I assume that problem started after I booted to readonly snapshot.
I ran

btrfs property set -ts /path/to/snapshot ro false

And FS is no more read-only. Then I rebooted to make sure it worked and FS is working as expected.
Hope this will help someone.

Last edited by judex_gauss (Yesterday 12:26:53)