I can confirm that issue on the latest development version of Ubuntu 20, on HiDPI 15" display (3840x2160) flatpak version looks less or more correct (still not very usable) and icon size setting works. repository version has tiny icons and icon size settings does not work.
-- You received this bug notification because you are a member of Ubuntu Studio Bugs, which is subscribed to gimp in Ubuntu. Matching subscriptions: Ubuntu Studio Bugs https://bugs.launchpad.net/bugs/1817389 Title: GIMP icon sizes small on large and huge setting Status in gimp package in Ubuntu: Confirmed Bug description: Description: Increasing the icon size setting increases the size on some UI elements, while decreasing the size of others. Sizes appear to increase up to a point, but once that point is reached, the size reverts to small. This occurs at large for most elements, but some get larger and revert at huge instead. Reproduce: $ gimp click: Edit -> Preferences -> Icon theme (under Interface section) -> Custom icon size (drop-down menu) then the toolbar icons of "Large" and "Huge" settings on the icon size slider are smaller than "Medium", being the same size as "Small" instead. Where I've reproduced it: Short: gimp 2.10.6 and 2.10.8 on Ubuntu 18.10 and Ubuntu 19. Long: I've reproduced it in an Ubuntu 18.10 fresh install and a qemu-kvm virtual machine. I've reproduced the problem in gimp 2.10.8 (apt) on Ubuntu 19 (development branch), so it doesn't look like it is fixed in newer versions. Where I couldn't reproduce it: When I tried to replicate it on Ubuntu 19 (development branch) with the flatpak from the gimp website, the bug did not occur. Same for 18.10. Gimp version must also be new enough to have icon size setting. NOTE: I've reported it on https://gitlab.gnome.org/GNOME/gimp/issues/2313 but thought that this bug would benefit from the attention of the Ubuntu Community/Canonical, given that the bug was reproduced on Ubuntu, but not on Debian, where gimp is an earlier version, or using flatpak. The problem may be with the apt installation, since flatpak works, and which the GIMP team might not be able to fix as easily as Ubuntu. $ lsb_release -rd Description: Ubuntu 18.10 Release: 18.10 $ apt-cache policy gimp gimp: Installed: 2.10.6-3 Candidate: 2.10.6-3 Version table: *** 2.10.6-3 500 500 http://us.archive.ubuntu.com/ubuntu cosmic/universe amd64 Packages 100 /var/lib/dpkg/status What I expected to happen: Icon size increases as slider increases through small, medium, large, and huge What happened instead: Icon sizes revert to small at large setting, other elements change in unexpected ways at huge setting. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gimp 2.10.6-3 ProcVersionSignature: Ubuntu 4.18.0-15.16-generic 4.18.20 Uname: Linux 4.18.0-15-generic x86_64 ApportVersion: 2.20.10-0ubuntu13.2 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Feb 22 19:48:01 2019 ExecutablePath: /usr/bin/gimp-2.10 InstallationDate: Installed on 2019-02-11 (11 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3) ProcEnviron: LANG=en_US.UTF-8 SHELL=/bin/bash TERM=screen-256color XDG_RUNTIME_DIR=<set> PATH=(custom, no user) SourcePackage: gimp UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gimp/+bug/1817389/+subscriptions -- Mailing list: https://launchpad.net/~ubuntustudio-bugs Post to : ubuntustudio-bugs@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntustudio-bugs More help : https://help.launchpad.net/ListHelp