Under Policies, I had enabled "Scan FTP" and "Scan HTTP" for Malware Scanning - however I noticed it caused an Error 500 for apt-get on Ubuntu trying to download Packages. Disabling the Malware Scanning fixed it.
apt-get update output:
Fehl http://de.archive.ubuntu.com trusty/main Sources
404 Not Found [IP: 141.76.1.204 80]
Fehl http://de.archive.ubuntu.com trusty/universe Sources
404 Not Found [IP: 141.76.1.204 80]
Fehl http://de.archive.ubuntu.com trusty/main amd64 Packages
404 Not Found [IP: 141.76.1.204 80]
Fehl http://de.archive.ubuntu.com trusty/universe amd64 Packages
404 Not Found [IP: 141.76.1.204 80]
Fehl http://de.archive.ubuntu.com trusty/main i386 Packages
404 Not Found [IP: 141.76.1.204 80]
Fehl http://de.archive.ubuntu.com trusty/universe i386 Packages
404 Not Found [IP: 141.76.1.204 80]
apt-get upgrade output:
Feh de.archive.ubuntu.com/.../ trusty-backports/main screen amd64 4.2.1-2~ubuntu14.04.1
500 Read-only file system [IP: 141.76.1.204 80]
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