Since git now mostly has SHA2-256 support gitk missing the support is now troublesome. In a repository with SHA2-256 enabled you get the error dialog: "Can't parse git log output: (commit dead...........beef tree 1234..)" And then immediately exits. I was able to find the patch: https://lore.kernel.org/git/20250617055957.9794-1-tiwai@suse.de/T/ Ideally this could have been in the recent Debian release. Good candidate for an update since such repositories are now likely to start appearing.