How do I make Bash my default shell on Ubuntu?

Use:

chsh

Enter your password and state the path to the shell you want to use.

For Bash that would be /bin/bash. For Zsh that would be /usr/bin/zsh.

On top of akira's answer, you can also edit your /etc/passwd file to specify your default shell.

You will find a line like this example:

john:x:1000:1000:john,,,:/home/john:/bin/sh

The shell is specified at the end.

Enable bash:

$ /bin/bash

Change shell for user:

$ sudo usermod -s /bin/bash username

where:

  -s, --shell SHELL             new login shell for the user account

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