I see a few problems:
* All of the repositories are commented out. You need to remove the `# `
from the repositories you want to use, or they will be ignored.
* `deb-src` lines are for downloading source packages. In order to be able
to download and install binary packages, you need to change `deb-src` to
`deb`. If you want to be to download both binaries *and* sources, then
duplicate the lines and in the copied lines change `deb-src` to `deb`.
* In the torproject line, you should probably change `xenial` to `bionic`,
since Trisquel 9 is based on Ubuntu 18.04 bionic.
