I don't know what these errors mean.
When you go to Help > About in Spark, what version and build does it show?
For me Spark's profile is still in /home/user/.Spark Though i'm using only 2.7.0 builds and i don't remember how it was with 2.6 or older versions (haven't used them in many years, but i think it should be same for 2.6 and 2.7). I'm using tar.gz one, download it and extract into Spark folder right in the Downloads folder (Ubuntu/Xubuntu), then run the Spark file (Xubuntu) or starter one (Ubuntu) and it works fine. Though recently on my Ubuntu machine it doesn't start, as some other programs. Ubuntu got busted after the recent major update, probably will have to reinstall it.