encounter the error message “Check if the com.unity.sysroot.linux-x86_64 package is installed” every time I open the project settings in Unity. I am a beginner so please help on where I can install the necessary stuff.
you probably need to install the linux module through the unity hub. this will automatically install the package for you. you can check whether this package exist in package manager(Window->Package Manager)
Is that neccessary given I intend to build games for Android? I will try that, though.