committed one hour ago:
https://framagit.org/Obarun/obarun-install-themes/-/commit/0afdd813911ecbc8fa6a6888ddd053dc0f10ae2f
So, normally when you update the obarun-install-themes you should not have the user-manager declared anymore at the package list to install.
Please, reboot, update again both script when it ask you and tell me.