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It was forgotten to replace sudo at one place with the variable for sudo.

* debian installer support

- normalize os name to lowercase
- check needed commands are available
- dont check sudo when root user
- share common install commands
- support debian cuda install
- skip aarm cuda install
- system user shared home dir

* refactor and add other platforms (#580)

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Co-authored-by: Michael Yang <mxyng@pm.me>

Co-authored-by: Michael Yang <mxyng@pm.me>