Hello all,
I preferred to post this issue here instead of the support just in case somebody else might face the same problem.
1. I upgrade my server from Ubuntu 16 to Ubuntu 18.4 and then to 20.4.
2. I upgraded the database to mysql 8.0
3. I removed PHP 7.0, 7.1, 7.2, 7.3, and 7.4 only left...