HP ThinOS (version 7 at the time of writing) is a modified version ubuntu xenial. You will find that the repository references are still present in /etc/apt/sources.list, so re-enabling package installation is rather straightforward:
- Activate administrator mode on the thin client
- Open an x-terminal (or use the build in graphical text editor)
- Remove the comments before the repo’s
Now your file should look like below
deb http://us.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ xenial main restricted universe multiverse
deb http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main restricted universe multiverse
Now, you can use apt-update, and install packages.
#fsunlock
#apt install nano
#fslock
BIG FAT WARNING: It may not be a good idea to blindly upgrade everything with apt-update && apt-upgrade, because you just might start overwriting HP stuff, you have been warned !