On Wednesday 05 November 2025 at 17:06:19, Peter via Dng wrote:

> > ... upgrade daedalus to excalibur.
>
> An alternative to the automated upgrade is a fresh install of the
> candidate system. In most machines, the HDD is large enough to have
> two or more /root parts.
>
> Eg. root1, root2. If a working system is in root2, install the
> candidate in root1. Reboot to test. If it works, good. In case the
> fresh system is unusable, revert to the older system easily.

Agreed, and extremely easy to do if you use Logical Volume Management.

I use LVM on almost everything, and I often use the name of the release for
the name of LV which is going to contain the root partition of my system, for
example:

Volume Group = "Laptop" (or maybe something more interesting)
Logical Volume = "Chimaera" - contains the root partition for a Chimaera
installation
Logical Volume = "Daedalus"...
Logical Volume = "Excalibur"...

I also often use rsync to copy what's in Chimaera into Daedalus, reboot the
machine into the Daedalus partition, and then perform an upgrade.

If it works, good; if not, I can just do a fresh installation of Daedalus into
that partition, and throughout the whole process I know that Chimaera is still
there and able to be used if I want to.


Antony.

--
Before you begin scrambling up the ladder of success,
make sure it's leaning against the right building.

- Stephen Covey

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