You talk about AppData folder but, as i said, i am on Ubuntu 
i just run the daemon and have these errors and it can't sync
Just use the prebuilt wallet provided in first post, its run well on my windows, just try on your linux and i think it will be normal as the windows wallet. I think the dev will make some changes with the github code to make the gui wallet i just run the daemon and have these errors and it can't syncVote Pinkstarcoin to be listed on C-CEX https://c-cex.com/?id=vote&coin=pnks
lets vote guys. btw, i dont have c-cex account, lol 
found other exchange site fyi: https://tradeogre.com