Unsatisfied package dependency on Debian based OS

Issue

imunify360-firewall : Depends: ai-bolit (>= xxxxxxx) but it is not going to be installed
Depends: app-version-detector (>= xxxxxxxx) but it is not going to be installed

Environment

• Imunify360
• Debian/Ubuntu
• Plesk 

Solution

Pass the "-o Debug::pkgProblemResolver=true" flag, it will show the nested unsatisfied dependency:

~# apt-get -o Debug::pkgProblemResolver=true install imunify360-firewall 2>&1 | \
         grep "Failed early"
  Reinst Failed early because of libargon2-0:amd64
  Reinst Failed early because of libargon2-0:amd64

Once that libargon2-0 dependency is solved, Imunify360 should install without issues. For this example, it has been solved by downgrading the libargon2:

root@plesk:~# apt list | grep libargon2                                                                                                         

libargon2-0/bionic 0~20161029-1.1 i386

libargon2-0-dev/bionic 0~20161029-1.1 amd64

libargon2-1/now 0~20190702-0.1+ubuntu18.04.1+deb.sury.org+1 amd64 [installed,local]

# apt-get install libargon2-0=0~20161029-1.1

After that, re-run the im360 deploy script, it should install imunify360 without errors.

Cause

The issue could happen due to unsatisfied dependency, it's needed to identify which package causes the broken dependency error, it may be a nested package coming from the operating system repository.

Useful links

https://docs.imunify360.com/installation/#installation-instructions.