Fix postfix error on Ubuntu

[ 🠺 About 🠸 ] I recently run into this error on Ubuntu when I upgraded it from 20.10 to 21.04. So in this guide, you will see how I fixed this error for the greater good.

If you run into any issue(s), let me know in the comments below. Also visit LinuxH2O blog: https://linuxh2o.com

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#postfix #ubuntu #Linux