owncloud client ssl error

An internal error number 1060 happened. Certificate verification error: signed using insecure algorithm.

Interne Fehlernummer 1060 aufgetreten. Zertifikatverifizierungsfehler: signed using insecure algorithm

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=13.04
DISTRIB_CODENAME=raring
DISTRIB_DESCRIPTION="Ubuntu 13.04"

Paket: owncloud-client                          
Version: 1.5.0