sudo apt install freeglut3

って打ったら

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
freeglut3 : Depends: libgl1-mesa-glx but it is not going to be installed or
libgl1
E: Unable to correct problems, you have held broken packages.

ってなるのはなんでや！！！！！
apt cleanしたり表示されてるパッケージinstallしようとしてみたけど一向に解決の緒が見えねええ
だれかこんな無能な僕に助言くださいお願いいたしますうううう