Installation problem on Colab

[hklchung]

Step 4 on Colab notebook gives the below error message:

E: Unable to correct problems, you have held broken packages.
Package manager quit with exit code.
/bin/bash: youtube-dl: command not found

FileNotFoundError Traceback (most recent call last)
in <cell line: 277>()
275 print("CUDA pip thread done.")
276
--> 277 t1.join()
278 print("VS plugin thread done.")
279

3 frames
in copytree(src, dst, symlinks, ignore)
28 #Note this is fixed in newer version of Python 3
29 def copytree(src, dst, symlinks=False, ignore=None):
---> 30 for item in os.listdir(src):
31 s = os.path.join(src, item)
32 d = os.path.join(dst, item)

FileNotFoundError: [Errno 2] No such file or directory: '/usr/lib/x86_64-linux-gnu/vapoursynth'

What can I do to fix this?