This is a known issue with the ioquake3 1.36 release for GNU+Linux x86_64. Compile from source or install from your distro to fix bots.
Bots do however work in the ioquake3 1.36 GNU+Linux x86 release.
The uninstaller does not work for ioquake3 1.36 for GNU+Linux (x86 and x86_64). See workaround for uninstalling at Ioquake3 Installation Problems with Ubuntu 18.04.