The installation process gets stuck in the middle, with not a single error.
But, after uploading manually the files to the server, the installation claims to have "upgraded" also all the "k2" stuff and akeeba component. Nice, isn't it?
Well. This is the result:
-k2 component just disappears from the backend (can't be managed)
-akeeba component just disappears from the backend (cant't be managed)
-although k2 items still exist, they can't be displayed on the site (no matter what you do with user permissions, menu links and so on).
Result: the site doesn't exist anymore.
The only good point with this extension is that, as it creates a separate directory for the new installation (/jupgrade), it's quite easy to send an FTP command to delete it.
After this, I'm going to try the manual installation process. But I will keep wondering why joomla recommends this component, given that almost 50% of users have given a a negative feedback.