Need some help for upgrade from 1.17 --> 2.19

After some month I'm now more active with my NAS and OMV again.

I'll try to upgrade to 2.19 as describes here by Volker : Upgrade to OMV 2.x

There I can read : To make sure you're running the latest OMV 1.x Version, read this thread to check for a rare problem.

My system is 1.17 and not the last 1.XY version ( 1.19 ) which was available in the past.

Entered at CLI omv-update and got error - > see scrennshot

My questions:

Should I delete the /etc/apt/apt.conf in my case too as decribed by ryecoaaron here ?

OMV 1.18 CRON-APT Error: The value 'stable' is invalid for APT::Default-Release as such a release is not available in the sources

What else I should do ? Unmout my data drives, delete users ?

THX

Have not yet deleted apt.conf file.

Just checked with the cat command. I've 7.8 - I think it's Wheezy.

What will now be the right way to continue with my udpdate to OMV 2.19 ?

O.k. I learned to delete apt.conf file and than run the two commands from the CLI

For secutity reasons I will unplug my data drives. No unmount and erasing of the users is necessary,
then :

CLI :
1. omv-update
2. omv-release-upgrade
3. Plug in the datadrives
4. Reboot the system

That's the coplete rigtht way and 'm on the air with 2.19 ?

THX

THX ryecoaaron

bcs you mentioned only the info about step 1./2. I conclude that my planed other steps are o.k. ? ? ? ?

I'll report the results.

After renaming apt.conf with WinSCP ( before I'll delete) I was able to update from 1.17 to 1.19 !

Then entered command : omv-release-upgrade and reveived message --> see Screenshot 1.

Question : How does I know that all my installed Plugins are available forr 2.XY ? ? ? ? ?

See my Plugins in Screenshot 2

THX