Revert "Remove Ubuntu specific line."

This reverts commit 49e48d2df111aa41841fb55d8e4257a1fe79b98f.
Remove not used code.
Remove support for already deprecated Ubuntu versions.
Do not allow to install cURL from sources on Debian Wheezy.
Use sysklogd instead of rsyslog on Ubuntu.
Check package status before forcing expected status again.
Silence cURL msg.
Merge branch 'refs/heads/master' into 2.3.x-dev