How to change the UID of a user with an encrypted home directory in Ubuntu

This tutorial is about changing the UID of a user with an encrypted, by ecryptfs, home directory in Ubuntu. You first need to logout the user you want to modify and kill all processes he runs. An easy approach is to restart and log in as root or as another sudo user. To enable the root user (by default it is disabled) execute the following commands: sudo passwd root Now you can log in using root and the password you provided.