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Go tohttp://archive.ubuntu.com/ubuntu/pool/main/o/openssl
find the exact version of libssl for example libssl1.1.1
wget http://archive.ubuntu.com/ubuntu/pool/main/o/openssl/libssl1.1_1.1.1-1ubuntu2.1\~18.04.20_amd64.deb
Then install
sudo dpkg -i libssl1.1_1.1.1-1ubuntu2.1~18.04.20_amd64.deb