ISPConfig OS Update not working
short description
The OS Update function in ISPConfig stops working in Debian 9 stretch
correct behaviour
On Debian 9 Stretch the aptitude command does not work beacause aptitude isn't installed anymore in Debian 9.
environment
Server OS: (Debian 9.0)
Server OS version: (Stretch)
ISPConfig version: (3.1.7)
proposed fix
use apt-get update && apt-get upgrade -y instead of aptitude
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