Gecko not recognised: the cabs have to be downloaded and copied to /usr/share/wine/gecko note a different cab version is needed for each version of wine. See
http://wiki.winehq.org/Gecko
If your distribution of Wine doesn't put the .cab file in the right place for you, you can avoid problems by putting it there yourself as follows:
$ wget
http://downloads.sourceforge.net/win...-1.0.0-x86.cab
$ sudo mkdir -p /usr/share/wine/gecko
$ sudo mv wine_gecko-1.0.0-x86.cab /usr/share/wine/gecko/
The above information is accurate for wine-1.1.27 or later. Older version of Wine use other Gecko versions:
wine-0.9.47 - wine-1.1.11
wine_gecko-0.1.0.cab
wine-1.1.12 - wine-1.1.14
wine_gecko-0.9.0.cab
wine-1.1.15 - wine-1.1.26
wine_gecko-0.9.1.cab
wine-1.1.27 - current
wine_gecko-1.0.0-x86.cab
If you installed Wine in some $prefix rather than /usr, it will look in $prefix/share/wine/gecko/ instead of /usr/share/wine/gecko. e.g. if you installed it from source, then the default-path is /usr/local/share/wine/gecko.