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[admin]

Install a working Adobe 9.5.5 to Mint 20.3
Note that it does add over 100MB of additional files to make it work.. (how cares?)

First make sure that your system is up to date by entering in a terminal..

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sudo apt update
Next add i386 packages to Mint. Adobe needs some of these packages to work.

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sudo dpkg --add-architecture i386
Next add software dependencies that Adobe requires. (Takes a while to upload)

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sudo apt install libxml2:i386 libcanberra-gtk-module:i386 gtk2-engines-murrine:i386 libatk-adaptor:i386
Next get the binary package for Adobe 9.5.5 (Takes even longer than software packages to download)

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wget -O ~/adobe.deb ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/AdbeRdr9.5.5-1_i386linux_enu.deb
Close the terminal and run the *.deb file.