On focal fossa Gimp will not open files on usb connected drives

[Tim Crowther]

On focal fossa Gimp refuses to open files on usb connected drives. It fails 'Permission denied'. Other software such as Image Viewer and Shotwell has no problem with the same files.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gimp (not installed)
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 13 19:05:36 2020
InstallationDate: Installed on 2020-04-12 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200409)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gimp
UpgradeStatus: No upgrade log present (probably fresh install)