Bug#904268: debian-installer: Improve instruction when the kernel doesn't support LVM

[root]

Package: debian-installer
Severity: normal

Dear Maintainer,

During the installation of a netinst image generated with `jigdo` (`jigdo-lite https://cdimage.debian.org/cdimage/weekly-builds/amd64/jigdo-cd/debian-testing-amd64-netinst.jigdo`) in VirtualBox 5.2.10 I encountered the information message

```
Logical Volume Manager not available
The current kernel doesn't support the Logical Volume Manager. You may need to load the lvm-mod module.
```
in the "Parition disks" section of the graphical installer.

This information is comprehensive, however I'd be much more useful if it would include instructions how to load the kernel module.

Please note that I'm not seeking support is this matter, my intention is to make the installation more intuitive.


-- System Information:
Debian Release: buster/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-24-generic (SMP w/8 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

[Cyril Brulebois]

Hi,

root <kric...@posteo.de> (2018-07-22):

> During the installation of a netinst image generated with `jigdo`
> (`jigdo-lite
> https://cdimage.debian.org/cdimage/weekly-builds/amd64/jigdo-cd/debian-testing-amd64-netinst.jigdo`)
> in VirtualBox 5.2.10 I encountered the information message
>
> ```
> Logical Volume Manager not available
> The current kernel doesn't support the Logical Volume Manager. You may need to load the lvm-mod module.
> ```
> in the "Parition disks" section of the graphical installer.
>
> This information is comprehensive, however I'd be much more useful if
> it would include instructions how to load the kernel module.

Not having lvm modules getting loaded automatically is generally the
sign of a kernel/module version mismatch, so I'm not sure there's much
to be done by users at that point…


Cheers,
--
Cyril Brulebois (ki...@debian.org) <https://debamax.com/>
D-I release manager -- Release team member -- Freelance Consultant

[Karl-Philipp Richter]

On Sun, 22 Jul 2018 19:59:35 +0200 Cyril Brulebois <ki...@debian.org> wrote

> Not having lvm modules getting loaded automatically is generally the
> sign of a kernel/module version mismatch, so I'm not sure there's much
> to be done by users at that point…

That sounds like a good thing to add to the message.