On Mon, 21 Sep 2020, Uwe Brauer wrote:
>
>I am running a Thinkpad X1, and upgraded from 16.04 to 20.04.
>
>I always use the tcsh shell, with the following setting
>set prompt   = '%B%n@%m:%~\n%T %#%b'
>
>That worked perfectly till now
>
>However now when repeat a command with left arrow up and then
>use the right and left arrow keys of my keyboard the
>cursor jumps the line and make it hard to modify the last command.
>
>Any pointers or information would be highly welcome

It looks like I see the same problem here when I enter tcsh and
set the prompt as you described.
However, I'm still on Ubuntu 16.04, and using Trinity 14.0.8 PSB.

But,tcsh is not my 'normal' shell.

Jonesy