Create from screenshot of region always fails: g_2dio_2derror_2dquark.Code19: Operation was cancelled

[Chris Bainbridge]

Do: File > Create > Screenshot > Select a region to grab > Snap > drag box

Results in error:

Execution error for 'Screenshot':
GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._g_2dio_2derror_2dquark.Code19: Operation was cancelled

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gimp 2.10.18-1
ProcVersionSignature: Ubuntu 5.4.0-84.94-generic 5.4.133
Uname: Linux 5.4.0-84-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 21 11:29:08 2021
InstallationDate: Installed on 2020-01-06 (623 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: gimp
UpgradeStatus: Upgraded to focal on 2020-10-09 (346 days ago)