reran lts 22 installer - could not alter prior partitioning

[Colin Watson]

On Sun, May 18, 2025 at 05:44:08PM -0400, Robert Moskowitz wrote:
>I did not "like" what the Ubuntu installer did.  I have a 500GB SSD 
>drive, and it only allocated 100GB to the / partition.

I believe the reason it errs on the small side is that it's easy to grow 
a logical volume and the filesystem on it, but once you've grown it it's 
a lot more effort to shrink it.  Not slurping up all the available space 
gives you far more flexibility.

>This Zotac Zboxnano has 2GB memory and I replaced this original HD 
>with said SSD drive.
>
>In /etc/fstab there is:
>
>/dev/disk/by-id/dm-uuid-LVM-Of0ciG9Rj2oEXQTBmqvSYhxN750GH9QTckCCW3W0nXsNN3J7fji735bWG831VRKD 
>/ ext4 defaults 0 1
># /boot was on /dev/sda2 during curtin installation
>/dev/disk/by-uuid/62887e8e-6dea-4bcc-a830-a9ec367fe578 /boot ext4 
>defaults 0 1
>/swap.img    none    swap    sw    0    0
>
>and df reports:
>
>Filesystem                         Size  Used Avail Use% Mounted on
>/dev/mapper/ubuntu--vg-ubuntu--lv   98G  5.1G   88G   6% /
>/dev/sda2                          2.0G  126M  1.7G   7% /boot
>
>I want to "grow" the partition with /

For example, to add an additional 50GiB:

   lvextend -L +50G ubuntu-vg/ubuntu-lv
   resize2fs -p /dev/mapper/ubuntu--vg-ubuntu--lv

(See "man lvextend" for variations on how to specify the size.)


I'm in a particularly good mood with LVM today, since it meant that 
recovering from an SSD that abruptly started throwing write errors and 
sent my house server into read-only mode was a matter of plugging in a 
new SSD, adding a new physical volume on it, running "pvmove" a few 
times, adjusting the boot loader, and dealing with a couple of 
filesystems where fsck was now a little unhappy.  I could have rsynced 
everything over onto fresh filesystems (since reading from the old drive 
still worked fine), or rebuilt from backups; but I've used the pvmove 
approach several times before and it's much easier, especially for 
filesystems such as / that are a hassle to remount.  If SATA hotplug 
worked properly on that motherboard then I wouldn't even have had to 
reboot except to confirm that the boot loader changes worked at the very 
end.

-- 
Colin Watson (he/him)                              [cjwatson at ubuntu.com]