See Having problems with UrBackup? Please read before posting and specifically https://urbackup.atlassian.net/wiki/spaces/US/pages/8323075/Debugging+with+gdb+on+Linux. The OpenSUSE Ubuntu builds have debug symbols if you don’t want to compile it yourself (e.g. at https://download.opensuse.org/repositories/home:/uroni/xUbuntu_20.04/amd64/ )