UID 1000 is assigned to the first user that is created in the system. On a standard desktop setup that is usually your user; on the base image for the lxc containers, the default user is 'ubuntu', which causes the duplicate uid.
UID 1000 is assigned to the first user that is created in the system. On a standard desktop setup that is usually your user; on the base image for the lxc containers, the default user is 'ubuntu', which causes the duplicate uid.