Install aufs-tools by entering the following commands in the terminal:
sudo apt update sudo apt install aufs-tools
Description:
Tools to manage aufs filesystems
The aufs driver provides a union mount for Linux filesystems. It allows one to virtually merge the contents of several directories and/or stack them, so that file changes in the aufs union mount end up as changes in only one of the source directories. . This package contains utilities needed to configure aufs containers on-the-fly.
Homepage: http://aufs.sourceforge.net/
Version: 1:4.9+20170918-1ubuntu1
Section: universe/kernel