How to edit a text file

My computer has been pretty much worthless all day and one very helpful user had a suggestion that would probably fix my problem in about 30 seconds… IF i know what to do with the instructions. Anybody want to dummy this down for me so I can work tomorrow?

> Pretty sure your issue comes from the faulty qubes-app-linux-usb-proxy package that was uploaded yesterday to current-testing.
**> **
> To fix it:
**> **
> Edit /usr/lib/python3.8/site-packages/qubesusbproxy/
> Add import collections anywhere in with the other imports
> Save and reboot

Very informative title, I hope you don’t mind I changed it.

A solution has been provided in your previous post, please don’t open a new thread for the same issue: SYSTEM IS BROKEN! Help Please - #9 by Vr3th

If you want a one-liner to fix your issue:

[user@dom0 ~]$ sudo sed -i '/import asyncio/a import collections' /usr/lib/python3.8/site-packages/qubesusbproxy/

Do you mind if I ask why you have current-testing enabled on a production (i.e., not testing) machine where if it goes down, you can’t get any work done? If the goal is just to get security updates ASAP, bear in mind that you can just enable security-testing instead.