symlink persist follow-up

[Keith]

On 9/24/23 5:43 AM, Grizzly via ubuntu-users wrote:
> Sunday, September 24, 2023  at 9:33, Ralf Mardorf via ubuntu-users wrote:
> Re: symlink persist follow-up (at least in part)
> 
>> On Sat, 2023-09-23 at 23:24 +0100, Grizzly via ubuntu-users wrote:
>>> fstab from Mantic
>>> UUID=c8264b8d-5caa-4515-b44b-a7c9c78f536a / ext4 errors=remount-ro,x-gvfs-show,x-gvfs-name=Jammy 0 1
>>> fstab from Jammy
>>> UUID=c8264b8d-5caa-4515-b44b-a7c9c78f536a / ext4 errors=remount-ro 0       1
> 
>> At least one entry for a root directory is wrong, since both are using
>> the same UUID. It's probably the one for Mantic, since an gvfs option
>> does name it Jammy.
> 
>> I'm not surprised that the correct root directory is mounted anyway,
>> since the boot loader might point to the correct root directory and we
>> have systemd-fstab-generator and native systemd units that might mount
>> devices that aren't listed in fstab.
> 
>> New to me is a fstab tainted with gvfs related options.
> 
>> I recommend as a first step to tidy up your install. IOW ensure that you
>> either use systemd units only or fstab entries only and don't use
>> anything else to mount.
> 
> Last time I went into fstab (from Mantic) I ended up not been able to boot, not
> been able to rebuild fstab from recovery console either, I had to boot Jammy
> then copy /etc/fstab edit (change UUID) it and paste to Mantic /etc/fstab
> (could be why they look close)
> 
> is there a "SAFE" way to (re)build / clean fstab ??

Well, the 23.10 fstab below should work. You'll need to make a 
subdirectory under /mnt to use as a mountpoint (I used jammy).  I also 
would verify the UUID's of root volumes for 22.04 and 23.10.

$ sudo blkid -o list /dev/sda3 <-22.04 uuid
$ sudo blkid -o list /dev/sdc3 <-23.10 uuid

OTOH, if it's working now, maybe don't mess any further with it.

-----------23.10 /etc/fstab ------------------------
# boot efi volume
UUID=92F5-3DEA /boot/efi vfat umask=0077 0 1

# 23.10 root volume
UUID=<uuid of /dev/sdc3 here> / ext4 errors-remount-ro 0 0

# 22.04 volume mounted on /mnt/jammy
UUID=c8264b8d-5caa-4515-b44b-a7c9c78f536a /mnt/jammy ext4 
errors-remount-ro 0 0

# swap
/swapfile none swap sw 0 0
---------------------------------------------------
> 
> I have it working, drive is mounted, symlink is seen but wallpaper is still
> default Maze, until I change it manully, it doesn't stick past reboot though
> 

-- 
Keith