sudo apt-get install python-software-properties sudo apt-add-repository ppa:dwrj87/mmex-test sudo apt-get update && sudo apt-get install mmex Here is the resulting output: fsdbass@fsd-Gaz:~$ sudo apt-get install python-software-properties [sudo] password for fsdbass: Reading package lists... Done Building dependency tree Reading state information... Done python-software-properties is already the newest version (0.96.20.5). The following packages were automatically installed and are no longer required: linux-headers-4.4.0-59 linux-headers-4.4.0-59-generic linux-headers-4.4.0-62 linux-headers-4.4.0-62-generic linux-headers-4.4.0-63 linux-headers-4.4.0-63-generic linux-headers-4.4.0-64 linux-headers-4.4.0-64-generic linux-image-4.4.0-59-generic linux-image-4.4.0-62-generic linux-image-4.4.0-63-generic linux-image-4.4.0-64-generic linux-image-extra-4.4.0-59-generic linux-image-extra-4.4.0-62-generic linux-image-extra-4.4.0-63-generic linux-image-extra-4.4.0-64-generic linux-signed-image-4.4.0-59-generic linux-signed-image-4.4.0-62-generic linux-signed-image-4.4.0-63-generic linux-signed-image-4.4.0-64-generic Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. N: Ignoring file '20auto-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension fsdbass@fsd-Gaz:~$ sudo apt-add-repository ppa:dwrj87/mmex-test Cannot add PPA: 'ppa:~dwrj87/ubuntu/mmex-test'. ERROR: '~dwrj87' user or team does not exist. fsdbass@fsd-Gaz:~$ sudo apt-get update && sudo apt-get install mmex Hit:1 http://us.archive.ubuntu.com/ubuntu xenial InRelease Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB] Hit:3 http://ppa.launchpad.net/dwrj87/mmex-test/ubuntu xenial InRelease Ign:4 http://linux.dropbox.com/ubuntu wily InRelease Hit:5 http://ppa.launchpad.net/system76-dev/stable/ubuntu xenial InRelease Get:6 http://linux.dropbox.com/ubuntu wily Release [6,596 B] Get:8 http://security.ubuntu.com/ubuntu xenial-security/main amd64 DEP-11 Metadata [54.2 kB] Get:9 http://security.ubuntu.com/ubuntu xenial-security/main DEP-11 64x64 Icons [42.4 kB] Get:10 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages [93.6 kB] Get:11 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB] Get:12 http://security.ubuntu.com/ubuntu xenial-security/universe i386 Packages [86.3 kB] Get:13 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB] Get:14 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 DEP-11 Metadata [32.1 kB] Get:15 http://security.ubuntu.com/ubuntu xenial-security/universe DEP-11 64x64 Icons [37.0 kB] Get:16 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 DEP-11 Metadata [288 kB] Get:17 http://us.archive.ubuntu.com/ubuntu xenial-updates/main DEP-11 64x64 Icons [195 kB] Get:18 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [434 kB] Get:19 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe i386 Packages [425 kB] Get:20 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 DEP-11 Metadata [151 kB] Get:21 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe DEP-11 64x64 Icons [175 kB] Get:22 http://us.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 DEP-11 Metadata [2,520 B] Get:23 http://us.archive.ubuntu.com/ubuntu xenial-backports/main amd64 DEP-11 Metadata [3,324 B] Fetched 2,332 kB in 39s (59.2 kB/s) Reading package lists... Done N: Ignoring file '20auto-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension Reading package lists... Done Building dependency tree Reading state information... Done mmex is already the newest version (1.2.7~xenial5). The following packages were automatically installed and are no longer required: linux-headers-4.4.0-59 linux-headers-4.4.0-59-generic linux-headers-4.4.0-62 linux-headers-4.4.0-62-generic linux-headers-4.4.0-63 linux-headers-4.4.0-63-generic linux-headers-4.4.0-64 linux-headers-4.4.0-64-generic linux-image-4.4.0-59-generic linux-image-4.4.0-62-generic linux-image-4.4.0-63-generic linux-image-4.4.0-64-generic linux-image-extra-4.4.0-59-generic linux-image-extra-4.4.0-62-generic linux-image-extra-4.4.0-63-generic linux-image-extra-4.4.0-64-generic linux-signed-image-4.4.0-59-generic linux-signed-image-4.4.0-62-generic linux-signed-image-4.4.0-63-generic linux-signed-image-4.4.0-64-generic Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. N: Ignoring file '20auto-upgrades.ucf-dist' in directory '/etc/apt/apt.conf.d/' as it has an invalid filename extension fsdbass@fsd-Gaz:~$