Don’t use sudo - you would be changing root’s shell, not yours.

If your short name is mike (you can check with whoami or who am i

sudo -s
chsh /bin/zsh mike

Or if you know an admin short name and password you could skip the sudo initially

chsh -u admin /bin/zsh

@ me if you still have issues, there are a couple other ways to skin this cat, but I think once you specify the other user and su to root first, you should be set. It should have just worked out of the box, but hopefully we don’t have to go down that rabbit trail.

Don’t use sudo directly without some additional switches - your invocation would change root’s shell, not your user account.

If your short name is mike (you can check with whoami or who am i

sudo -s
chsh /bin/zsh mike

Or if you know an admin short name and password you could skip the sudo initially

chsh -u admin /bin/zsh

@ me if you still have issues, there are a couple other ways to skin this cat, but I think once you specify the other user and su to root first, you should be set. It should have just worked out of the box, but hopefully we don’t have to go down that rabbit trail.