At times, in systems configured to use both IPv4 and IPv6 addresses the debian package manager (apt / apt-get / aptitude) uses IPv6 by default for outgoing connections and fails to resolve/connect. The solution is to force it to use IPv4

Add -o Acquire::ForceIPv4=true when running apt-get or apt.

If you want to make the setting persistent just create /etc/apt/apt.conf.d/99force-ipv4 and put Acquire::ForceIPv4 "true"; in it:

echo 'Acquire::ForceIPv4 "true";' | sudo tee /etc/apt/apt.conf.d/99force-ipv4

Script 1:

wget freevps.us/downloads/bench.sh -O - -o /dev/null | bash

Script 2: (Credits)

wget dl.getipaddr.net/speedtest.sh 2>/dev/null -O- | bash