Hey @joe-average-user. Welcome to the forums + thanks for the questions. 
(I edited your post a little by adding a little code “triple-backticks” to make the console output easier to read.)
Q1. What is your exact versions of:
- Collabora?
- Nextcloud?
Are you running Nextcloud’s richdocuments?
Q2. What installation instructions were you following? Can you please link me to them?
Nothing is wrong with your install there.
The WRN “Read-only file system” + “common/JailUtil.cpp” warnings shouldn’t show up in recent builds. See recent response in:
Hmmm… seems like vereign might be some sort of “document signing” thing. Perhaps a Dark version of the PNG icon is missing somewhere.
Were you getting this in your terminal when visiting a certain menu?