'Could not open' install extensions, themes, coa and languages

Thanks tm.

I installed php5-curl package and still "Could not open" when I try to install an extension.

Suggestions?

i had the same pb, at the end  i gave up. i just installed anything i need manually.

for themes : just unzipped the archive and drop it in the themes folder, they'll appear in the theme combobox.
for languages, you can either install it manually using the FA wizard for that : see install manually, you'll need to download the xx_XX.po and xx_XX.mo. the wizard is pretty straithforward.; or you can create a xx_XX folder under the lang folder, then copy the po and .mo file. you need to set some modifications in installed_languages.inc, there is a template you can follow.
the extension: it's more tricky. i'll send a more detailled post tomorow (i hope) for the extension installation.

for extension i download the sources from the git repository. Usually you'll find in the folder extension  a hooks.php which redefine functions from hooks.inc.
each function is used to process a certain task during the installation.
for example:   

function install_tabs($app) {
// $app->add_application(new example_class); // add menu tab defined by example_class
    }

all the functions are well documented, sometimes with code example.
well, the trick is to copy files where needed, copy code where needed, execute sql, add access rights ..... etc.
i still don't master all process,  sometimes i need to go through debugging process to find what's wrong. that's it.
hope this help

nothing is difficult if you keep trying. i just started php a couple of months ago, and i'm still learning ....