I encountered this problem after a Guest session crashed on Xubuntu 12.04 (Precise Pangolin) amd64/x86_64. The crash was probably due to a fglrx bug but /etc/group.lock kept users-admin and adduser from adding any new users.
I encountered this problem after a Guest session crashed on Xubuntu 12.04 (Precise Pangolin) amd64/x86_64. The crash was probably due to a fglrx bug but /etc/group.lock kept users-admin and adduser from adding any new users.