[ubuntu-studio-devel] LiveFS ubuntustudio/disco/amd64 failed to build on 20190309

[Ross Gammon]

Hi Erich,

On 3/10/19 1:55 PM, Ross Gammon wrote:
> Hi Erich,
> 
> It seems there is a problem with the plymouth theme post-install
> maintainer script in ubuntustudio-look.
> 
> On 3/9/19 7:31 PM, CD Image wrote:
>> Setting up plymouth-theme-ubuntustudio (0.57) ...
>> update-alternatives: using /usr/share/plymouth/themes/ubuntustudio-logo/ubuntustudio-logo.plymouth to provide /usr/share/plymouth/themes/default.plymouth (default.plymouth) in auto mode
>> update-alternatives: using /usr/share/plymouth/themes/ubuntustudio-text/ubuntustudio-text.plymouth to provide /usr/share/plymouth/themes/text.plymouth (text.plymouth) in auto mode
>> update-initramfs: diverted by livecd-rootfs (will be called later)
>> /usr/sbin/grub-probe: error: cannot find a device for / (is /dev mounted?).
>> dpkg: error processing package plymouth-theme-ubuntustudio (--configure):
>>  installed plymouth-theme-ubuntustudio package post-installation script subprocess returned error exit status 1
> 
> I haven't tried upgrading my test Disco machine yet, which I will do
> some time today. Any ideas?
> 
> Cheers,
> 
> Ross
> 

Well, the update went fine on an already installed Disco:
Setting up plymouth-theme-ubuntustudio (0.57) ...
update-alternatives: updating alternative
/usr/share/plymouth/themes/ubuntustudio-logo/ubuntustudio-logo.plymouth
because link group default.plymouth has changed slave links
update-initramfs: deferring update (trigger activated)
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.19.0-13-lowlatency
Found initrd image: /boot/initrd.img-4.19.0-13-lowlatency
Found linux image: /boot/vmlinuz-4.19.0-13-lowlatency
Found initrd image: /boot/initrd.img-4.19.0-13-lowlatency
Found Ubuntu 18.10 (18.10) on /dev/sda2
Found Ubuntu 18.04.2 LTS (18.04) on /dev/sdb1
Found Ubuntu 18.10 (18.10) on /dev/sdb2
Found Ubuntu Disco Dingo (development branch) (19.04) on /dev/sdb3
Adding boot menu entry for EFI firmware configuration
done

I am a bit out of my comfort zone here, but it seems that /dev might not
mounted at this stage in the LiveCD installation process.

Do we need to add back in the guard that was taken out recently?:
if [ -e /boot/grub/grub.cfg ] && which update-grub2 >/dev/null 2>&1; then

Using Debian Code Search, I found a few other packages where this is
used and the comments mention being in a build chroot:
https://codesearch.debian.net/search?q=path%3Adebian%2F*.postinst+update-grub

Cheers,

Ross