gpg: can't open `–': No such file or directory
Your only problem is that the dash after apt-key add
is not the ASCII 0x2D hyphen character, but the Unicode U+2013 en dash. The former instructs apt-key
to read the key from the standard input (where the preceding wget
provides it through the pipe), while the latter is not treated specially, thus interpreted as a file name to read the key from. Unsurprisingly, such a file does not seem to exist in your current directory.
Use this:
wget -qO - http://www.dotdeb.org/dotdeb.gpg | apt-key add -
You need a space after the -O
and the character after add
seems to be wrong. -q
turns off the output of wget
.