debconf warning during apt-get

[markfirmware]

debconf: unable to initialize frontend: Dialog^M
debconf: (TERM is not set, so the dialog frontend is not usable.)^M
debconf: falling back to frontend: Readline^M
debconf: unable to initialize frontend: Readline^M
debconf: (Can't locate Term/ReadLine.pm in @inc (you may need to install the Term::ReadLine module) (@inc contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.20.1 /usr/local/share/perl/5.20.1 /usr/lib/x86_64-linux-gnu/perl5/5.20 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.20 /usr/share/perl/5.20 /usr/local/lib/site_perl .) at /usr/share/perl5/Debconf/FrontEnd/Readline.pm line 7.)^M
debconf: falling back to frontend: Teletype^M