The following additional packages will be installed: Use 'sudo apt autoremove' to remove them. Java-wrappers linux-image-unsigned-4.15.0-34-generic The following packages were automatically installed and are no longer required: So let’s go ahead and install the same using the below command. Now we are ready to install PuTTY SSH and Telnet Client package. apt-get update cannot be used to add new CD-ROMs Please use apt-cdrom to make this CD-ROM recognized by APT. Ign:1 cdrom://Ubuntu 18.04.1 LTS _Bionic Beaver_ - Release amd64 (20180725) bionic InReleaseĮrr:2 cdrom://Ubuntu 18.04.1 LTS _Bionic Beaver_ - Release amd64 (20180725) bionic Release Before installing the PuTTY SSH and Telnet Client, we will need to install the required PPA repositories.