Arg: no mdadm on Ubuntu 18.04.5 Desktop install disk?

[Tony Arnold]

Hi Robert,

On Sat, 2021-01-02 at 16:04 -0500, Robert Heller wrote:
> Arg! I want to install Ubuntu 18.04.5 on a LVM volume in the LVM
> container on
> my *existing* CentOS 6.10 system. The LVM container is on a software
> RAID disk
> (simple mirror set). This *appears* not to be possible (?) since the
> Ubuntu
> installer is not starting/seeing the RAID array and in live mode,
> mdadm
> appears absent (question: what happens if I try to run apt-get
> install mdadm
> on a live ISO system?).

It's not on the 20.04 live disk either as I just discovered. You can
install mdadm with the above command on the live ISO system, manually
assemble the disk array and proceed to the install. The installer
should see the logical volumes then.

TBH, I've not tried installing to a raid array. I have a single ssd for
the system and 2 spinning disks in a raid1 mdadm configuration. But
I've done the above when I'ved needed to do an off-line fsck of my home
volume.

> WTF? Does Ubuntu 18.04 in fact not support software RAID during
> installation?

Not OOTB by the looks of things.

> How am I supposed to procede?

See above.

Hope this is of some help.

Regards,
Tony.
-- 
Tony Arnold MBCS, CITP | Senior IT Security Analyst | Directorate of IT Services | Office 1, Kilburn Building | The University of Manchester | Manchester M13 9PL | T: +44 161 275 6093 | M: +44 773 330 0039
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