Kolab migration on debian

[Christoph Erhardt]

Hi Andrea,

while that upgrade path isn't officially documented anywhere, I've practised 
it successfully several times (Debian 7 -> 8 -> 9 -> 10). Essentially, you 
need to perform the following steps:

1. Plan for downtime and have an exit strategy at hand in case things should 
go awry (unlikely, but you never know).
2. Back up everything of importance, *including config files*.
3. Change the URL in `/etc/apt/sources.list.d/kolab.list` from `Debian_8.0` to 
`Debian_9.0`.
4. Follow the official Debian upgrade guide: https://www.debian.org/releases/
stretch/amd64/release-notes/ch-upgrading.en.html

Some post-treatment (such as manual merging of config files) may be necessary 
in the aftermath, but it's nothing a seasoned sysadmin would be overwhelmed 
by.

Best,
Christoph

On Monday, 20 September 2021 16:58:31 CEST Gelpi Andrea wrote:
> Hi all,
> 	I have and old Kolab 16 installed on Debian 8.x
> 
> I'd like to move to debian 9.x, possibly on site.
> 
> Is there any documentation path anywhere?
> 
> Thanks in advance

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