Running commands in PureOS Linux debian variation.
 

Trying to run a .run file from a Linux installer and am getting
e: Unable to locate package tresorit_installer.run
Couldn't find any package by glob 'tresorit_installer.run
Couldn't fin any package by regex 'tresorit_installer.run


Any thoughts to help me? It's been a very long time since I did UNIX/Linux command line stuff and I don't remember all the responses from the Big Red Book

Navigate to the directory the tresorit_installer.run is in, issue command: sudo chmod +x tresorit_installer.run
Then install with command: sudo ./tresorit_installer.run

A different error - Brains.. (Thanks)
 

Hey Brains, now I've got qt.qpa.screen: QXcbConnection: Could not connect to display :0
Could not connect to any X dispaly.

According to Tresorit Faq page, they recommend the second command should not be executed without sudo, which is rare, most .run files require root to install. But, all it does is unpack to the directory mentioned in the quote above, it's possible that because of the use of sudo, it was unpacked in /root directory, in which you can delete them and run it without sudo in your user's home directory. But simply unpacking an archive should not have contributed to the error in the first quote above.
What led to this error?