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chsh -s /bin/bash username # will ask for password
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# find out the available shells on your Linux box, run
cat /etc/shells
# copy the new shell full path
# run this command to change your shell
chsh
# paste the the new shell full path and press enter
# good luck ;)
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#to change your default shell on any GNU/Linux distro
#you need to use chsh
#For example if you want to change your default shell to bash
#you need to do this:
#first you need the full path to the bash executable
chsh -l
#then using the path for bash you need to write:
chsh -s /your/path/to/bash
#chsh -s /bin/bash for example