Dual Boot: Boot error

There was an error. trying to build envycontrol it said:

(my own translation:) “process could not be prepared successfully: invalid or damaged databank”.

BTW
The forumuser Nachlese taught how to use manjaro-chroot from a live usb. I think it would be easier to work this way. In tty I for example can not look at the forum or make screenshots. Once or twice during our problem solving here I actually used it. Just update-grub did’nt work, I think because a partition wasn’t mounted or something like it. (And I don’t know the basics :smile: ). So maybe it won’t be a big issue for you to tweak your advice for working from live USB and chroot.

Or is it not recommendable for any reason?

Also their is at least one other thread with a similar problem under Gnome:

Is there anything to be learnt from or doesn’t it apply for my case?