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Ubuntu upgrade

1. Update /etc/lsb-release:

   apt-get install base-files software-properties-common python3-apt python-apt-common
   

   • base-files contains /etc/lsb-release itself;
   • python-apt-common contains templates to read lsb-release;
   • software-properties-common contains add-apt-repository binary;
   • python3-apt contains library to use templates by add-apt-repository.

   Alas, no one depends on each other's version properly.