Setup script need adjustment to work with Ubuntu 20.04 Focal Fossa

[RealAkito]

• python-pip package is deprecated
• replace pip to pip3

And,

Package android-tools-fsutils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  android-sdk-libsparse-utils android-sdk-ext4-utils

E: Package 'android-tools-fsutils' has no installation candidate

Potentially replace it with one of these packages.

If you need me to make a PR for it please let me know.

[ShivamKumarJha]

thanks, will merge it

[ShivamKumarJha]

96b7e65