Overview for rant

Because of the recent expiry of the certificate used to cross-sign Let's Encrypt certificates, Android gets confused when you try to use them for DoT.

Confusing error messages sent me on a debugging spree because of an interesting Jellyifn quirk.

TL;DR: if you have configured an alternative ffmpeg path in Jellyfin, make sure there's an ffprobe binary in the same location with the same file extension. In my case, this was solved by running:

ln -s `which ffprobe` /usr/local/bin/ffprobe.py

The course "Mobile and Wireless Networks" (given on University of Twente) requires students to buy a reader to read along. This reader consists of several chapters and papers from different authors which are available freely on the web. This page lists those chapters and paper so that you, as a student, can just find the papers yourself online instead of having to waste paper printing these articles.

The reader in question is:
Mobile & Wireless Networking (G. Heijenk)
Reader 018 (februari 2019)
Vakcode: 192620010

I've noticed over the past weeks I've been using Xubuntu more than I have been using Windows. Why though?