I followed the Linux installation instructions on the pscan website. I'm using a Debian Linux distribution not ChromeOS. 

I downloaded pscanloader to $/Downloads/ from my Web browser.

Using the desktop graphical file app, I navigated to Downloads in my home directory.

I right-clicked pscanloader and dropped to Properties then to Permissions. I then selected the executable option then OK.

I hadn't used the terminal to make these changes and only opened it to check membership of the dialout group - again, instructions on pscan website.

A double-click on psacanloader file from the desktop file browser (app) runs the program as expected, initially downloading the pscanapp and the licence.

Being a Linux newbie I had previously moved the pscanloader to a directory for which I didn't have permissions and it couldn't download the additional programs. Keeping it in one of the /home/ directories was the solution. A note to that effect in the instructions could be useful to another novice!

I'm extremely pleased with my pscan.

Good luck!

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