System Information
Operating system: Linux-5.4.61-1-lts-x86_64-with-glibc2.29 64 Bits
Graphics card: Quadro K1000M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66
Blender Version
Broken: version: 2.90.0, branch: makepkg (modified), commit date: 2020-08-31 11:26, hash: rB0330d1af29c0
Worked: (newest version of Blender that worked as expected)
Short description of error
[I can't find build-in add-on in user preference such as bool tool, loop tool, node wrangler. All gone except Render: Cycle Render Engine add-on ]
Exact steps for others to reproduce the error
[Update to 2.9, start Blender, keep everything in default, go to edit user preference, go to add-on tap]
[Based on the default startup or an attached .blend file (as simple as possible)]