Linux/Rename User and Home Directory

Change user name, and rename home directory:

# -m, --move-home
# -l, --login NEW_LOGIN
# -d, --home HOME_DIR
sudo usermod -m -l newuser -d /home/newuser  olduser

Fix user's default group:

# -n, --new-name NEW_GROUP
sudo groupmod -n newuser  olduser

..

Should not be needed, but just in case??

sudo chown -R newuser:newuser /home/newuser