Complete noob with ubuntu and linux here, so excuse the "noobity". I'm using Ubuntu desktop 16.04 LTS.
Installed XAMPP yesterday, viewed my site on it and all was good. After a restart, while trying to do some of the things I did yesterday -simple functions like editing files or copy and paste- I'm getting a "Error opening file 'filename': Permission denied" error.
EDIT: I'm also seeing lockpads on the opt/lampp directory's contents.
I searched before sending this question, but found nothing that I understood. Any help is highly appreciated.