debian apt packages hash sum mismatch

If deleting /var/lib/apt/lists/* does not work...
(esp. if you're behind a proxy), fix "Hash Sum Mismatch" like this:

Create file /etc/apt/apt.conf.d/99fixbadproxy
with this content

Acquire::http::Pipeline-Depth 0;
Acquire::http::No-Cache true;
Acquire::BrokenProxy    true;

See also here

Try using apt-get:

apt-get clean
rm -rf /var/lib/apt/lists/*
apt-get clean
apt-get update
apt-get upgrade

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