>Well, the only device using debian packages where navigation makes sense is N9, you will find all the features you mention there. I leave it up to you to search for a debian packaged barcode/qr-code scanner there, see if you can find it yourself.
Nope. N9 uses common app-store approach with solid packages, N9 does NOT use .deb-files-with-dependencies approach for software packaging.
>As for Qr-code, did you know that generating qr-codes is built into the clip board tool in KDE, so that you can generate a qr-code out of everything on the clip board with a click? One of hundreds of useful features I miss on any proprietary desktop.
So I want to scan QR/bar codes with my camera, recognize them and search information based on it. There are tons of 'useless' Android apps that do this.
Certainly, there should be at least one mega-useful Debian QR-scanner among these 50000 packages, right? (Well, no, I've just rechecked it)
Note, I'm thinking as a typical user.
>If devices with it comes with GPS, you can expect work on free navigation software to catch on.
No, I don't expect it (after 10 years of waiting). Navigation requires licensing of map data which is complicated and expensive.
So far, the only freely available map is OpenStreetMap which is woefully inadequate.