We have moved our forum to GitHub Discussions. For questions about Phalcon v3/v4/v5 you can visit here and for Phalcon v6 here.

Is anybody tried to install Phalcon with PHP 5.5 on Linux?

Is it works stable?

Afaik, php 5.5 wont issue into any issues. There was only a few deletion/standards evolution from 5.4 to 5.5.