Comment 28 for bug 1832182

I had the same problem.

# uname -m
x86_64

# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.7 LTS
Release: 16.04
Codename: xenial

# dpkg -l \*apache\* | grep ^i
ii apache2 2.4.18-2ubuntu3.18 amd64 Apache HTTP Server
ii apache2-bin 2.4.18-2ubuntu3.18 amd64 Apache HTTP Server (modules and other binary files)
ii apache2-data 2.4.18-2ubuntu3.18 all Apache HTTP Server (common files)
ii apache2-dev 2.4.18-2ubuntu3.18 amd64 Apache HTTP Server (development headers)
ii apache2-utils 2.4.18-2ubuntu3.18 amd64 Apache HTTP Server (utility programs for web servers)

only solution for me was to downgrade back to 2.4.18-2ubuntu3.17 too