Rename the Volume Group of an USB stick, which uses LVM

[Volker Wysk]

Am Montag, den 22.06.2020, 14:57 +0200 schrieb Volker Wysk:
> Hi!
> 
> I'm trying to build an encrypted rescue/maintenance system on an USB
> stick. Therefore, I've installed Ubuntu 20.04 on the USB stick. I'm
> using the regular Ubuntu installer to do the installation, which
> makes
> use of LVM in case of encryption of the disk. A volume group named
> "vgubuntu" is created.
> 
> Now I have to rename the volume group of the system on the USB-Stick
> to
> avoid conflicts, especially with my laptop's main system. I've had
> this
> problem in 2017, and Xen answered my question in 2017-12-09:
> 
> -----snip-----
> BEFORE you do any cryptsetup open on the main system, run:
> 
> vgrename kubuntu-vg rescue-vg
> 
> Then you must verify that /etc/fstab in the RESCUE system contains no
> references to "kubuntu-vg" and you might also have to rerun
> "update-grub" if you want to keep it this way.
> 
> That is all you need to do to rename the volume group.
> 
> After that you can open the crypt and it won't conflict.
> -----snip-----
> 
> I've followed these instructions now, and renamed "vgubuntu" to
> wartung". But the "update-grub" step doesn't work. I get the message
> (translated back from German) "Canonical path of
> /dev/mapper/vgubuntu-
> root could not be determined".
> 
> After making a symlink from /dev/mapper/wartung-root to
> /dev/mapper/vgubuntu-root, the "grub-setup" works, but booting the 
                                  ^^^^^^^^^^ 
That's "update-grub", not "grub-setup". Sorry.

> USB-
> stick fails. I get a busybox rescue shell.
> 
> So what is missing? 
> 
> Cheers
> Volker
> 
>