Note it says "use option --keyserver
", and it looks like you used -keyserver–keyserver
; you're missing a dash/hyphen, so it's screwing up your entire command.
Extending on that: LookingActually, looking closer at your screenshot and your example log entries, it looks like you actually used an "em"en dash" (or perhaps an "en"em dash") instead of a hyphen:
My guess would be that you've copied and pasted that command from someplace, and something along the way 'autocorrected' the double-dash to an emthe en dash.
The correct commands are as follows:
apt-get remove iceweasel
echo -e "\ndeb http://downloads.sourceforge.net/project/ubuntuzilla/mozilla/apt all main" | tee -a /etc/apt/sources.list > /dev/null
apt-key adv --recv-keys --keyserver keyserver.ubuntu.com C1289A29
apt-get update
apt-get install firefox-mozilla-build