Why they might have been broken
On the first post you referred, I think it might have been due to the fact that you left the first line:
On 2/14/20 6:07 AM, Unman wrote:
> The packages are in qubes-packages-mirror-repo, in the "deb"
> directory under vm name. You can indeed just copy them in and
> install.
And that may look like the start of the previous email.
Looking at the raw email text of that post I observe the following:
What happens if you try to launch by dom0 terminal?
> qvm-run -a my_qube xterm
in particular, there is a space before the >. Could it have been that? And where could that have been inserted? seems like on the original message it is aligned on the left…