Can't See Printers from Certain Apps

[Douglas Summers]

On Mon, 2019-08-12 at 14:23 +0200, Alexander Larsson wrote:
> On Sun, Jun 16, 2019 at 8:09 PM Douglas Summers <ajgringo619 at cox.net>
> wrote:
> > 
> > (I apologize in advance; I remember asking a similar question a few
> > months ago, but I couldn't find it in the list archives)
> > 
> > I was trying to help a Linux Mint 18.3 user with a printing problem
> > with LibreOffice (can't see his local USB-connected printer) and I
> > was
> > reminded of an issue I had (and still have) with Okular not seeing
> > my
> > WiFi-connected printer. I tried Okular again today to see if the
> > issue
> > was fixed, and sadly it is not.
> > 
> > Now, for me the printing issues with LO have never come up (been
> > using
> > Linux Mint since version 18.1). I had the user try upgrading to the
> > latest version of Flatpak via the PPA, but it didn't make any
> > difference. He's also having the same problems with Scribus.
> > 
> > I know Flatpak can give apps additional permissions - can someone
> > point
> > me in the right direction?
> 
> Accessing printers, with drivers, configuration,etc is quite tricky
> from a sandbox. The way this is meant to work in flatpak is for the
> app to use the printing portal, which actually runs the print dialog
> on the host, so it should see everything configured on the host. I
> *think* the kde print portal is supposed to be wired up to Qt, so
> okular *should* work.
> 
> Maybe there is a general issue with the portal support on the host?
> Are you running kde or gnome? If gnome, do you have
> xdg-desktop-portal-gtk installed, and what version. If kde, same for
> xdg-desktop-portal-kde?

I'm running Cinnamon; xdg-desktop-portal-gtk is installed. I tried
installing xdg-desktop-portal-kde, but it made no difference.