I can select and copy text with PDFjs!
https://open-store.io/app/pdfjs.pparent
It works with PDF files that contain actual text (as in, PDF files that aren't visual scans of text... I don't know how to say this!).
Is it available in Xenial? I'm on 24.04-1.0.
I casually watched a part of that Q&A session! This thread was mentioned and it will be looked into: https://www.youtube.com/live/XorXLuKl2KE?feature=shared&t=1202
I have a question regarding Liberapay. 
I'm donating to ubports-foundation: https://liberapay.com/ubports-foundation/
But there also is UBports, which is a team ubports-foundation is a part of: https://liberapay.com/UBports/
What's the difference between them?
Perhaps UBports was created first and, when the foundation was established some years later, a new account was created? Should we donate to ubports-foundation?
The PayPal, Liberapay and Patreon images on the donate page do nothing when clicked: https://ubports.com/donate