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