Linux module doesn't seem to link unity, but i already did it!

Although i installed module about Linux, I can't build project with Linux in 2021.2.15 Error Message is "Currently selected scripting backend (mono) is not installed" in Build Setting window

I have checked Editor.log file, also location of .dll file for linux which is pointed by Editor.log I don't know how to solve this problem. I'll add some picture about this.

 Register platform support module: /Applications/Unity/Hub/Editor/2021.2.15f1/PlaybackEngines/WebGLSupport/UnityEditor.WebGL.Extensions.dll
 Register platform support module: /Applications/Unity/Hub/Editor/2021.2.15f1/Unity.app/Contents/PlaybackEngines/MacStandaloneSupport/UnityEditor.OSXStandalone.Extensions.dll
 Register platform support module: /Applications/Unity/Hub/Editor/2021.2.15f1/PlaybackEngines/WindowsStandaloneSupport/UnityEditor.WindowsStandalone.Extensions.dll
 Register platform support module: /Applications/Unity/Hub/Editor/2021.2.15f1/PlaybackEngines/LinuxStandaloneSupport/UnityEditor.LinuxStandalone.Extensions.dll
 Registered in 0.000912 seconds.