How to install on Ubuntu 18.04 64bit

at flag

I'm using:

Linux ip-172-31-28-209 5.4.0-1059-aws #62~18.04.1-Ubuntu SMP Fri Oct 22 21:51:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

I encounter an error while running a program:

while loading shared libraries: wrong ELF class: ELFCLASS32

How can I resolve it?

I looked at this post, but it's for 32bit version of Ubuntu.

zw flag

Even after 13 years this 64-bit library can be installed by direct download using commands below:

cd ~/Downloads
wget -c
wget -c
sudo apt-get install ./gcc-3.4-base_3.4.6-6ubuntu3_amd64.deb ./libg2c0_3.4.6-6ubuntu3_amd64.deb

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