Comment 1 for bug 1449404

Same for me:

vova@vova:~$ php -v
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20131226/curl.so' - /usr/lib/x86_64-linux-gnu/libgnutls-deb0.so.28: symbol asn1_delete_structure2, version LIBTASN1_0_3 not defined in file libtasn1.so.6 with link time reference in Unknown on line 0
PHP 5.6.4-4ubuntu6 (cli) (built: Apr 17 2015 15:47:51)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2014, by Zend Technologies

vova@vova:~$ virtualbox
VirtualBox: Error -610 in supR3HardenedMainInitRuntime!
VirtualBox: dlopen("/usr/lib/virtualbox/VBoxRT.so",) failed: /usr/lib/x86_64-linux-gnu/libgnutls-deb0.so.28: symbol asn1_delete_structure2, version LIBTASN1_0_3 not defined in file libtasn1.so.6 with link time reference

VirtualBox: Tip! It may help to reinstall VirtualBox.