sudo apt-add-repository ppa:cdemu/ppa && apt-get update && apt-get install gcdemu
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv AFDF4CC6A4F32AA9395FAE8F423A2125D782A00F
gpg: D782A00F hkp keyserver.ubuntu.com
gpg: D782A00F: "Launchpad PPA for CDEmu"
gpg: : 1
gpg: : 1
E: /var/lib/apt/lists/lock - open (13: )
E: /var/lib/apt/lists/
E: /var/lib/dpkg/lock - open (13: )
E: (/var/lib/dpkg/); ?
.