Tab for "Other software" repositories isn't usable with keyboard

[Alan Jenkins]

The "other software" tab isn't keyboard-accessible.

The list of software repositories can be navigated using the keyboard instead of a mouse. However it's not possible to enable/disable the repositories. Neither Enter nor Space have any effect on the checkboxes.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: software-properties-gtk 0.92.37.1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: i386
CurrentDesktop: LXDE
Date: Mon May 26 13:54:08 2014
PackageArchitecture: all
SourcePackage: software-properties
UpgradeStatus: Upgraded to trusty on 2014-05-22 (4 days ago)

[Paul White (paulw2u)]

Still an issue in version 0.96.24.36 (Ubuntu 18.10 dev).
Seems to affect just the "Other Software" tab.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Norbert (nrbrtx)]

Got this bug on 19.10.
Only "Remove" button has mnemonics (<R>), but "Add" and "Edit" do not have keyboard mnemonics/accelerators.
So I'm unable to edit repository only by using keyboard.