ArrayFire could not load libaf.so.3

After installing ArrayFire through the Julia Package manager and trying to run a simple program:

```
using Pkg
Pkg.add("ArrayFire")
using ArrayFire

const a = rand(10, 10)
const ad = AFArray(a)
```

I obtain the following error:


I tried installing libarrayfire-unified3 but I get the same error.
After that I decided to go inside my julia installation folder, specifically: `/opt/julia-1.5.1/lib/julia` and move `libstdc++.so.6` to `libstdc++.so.6_old` so that I could create a symbolic link with my system `libstdc++.so.6` (`ln -s /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /opt/julia-1.5.1/lib/julia`). The problem was solved, however I got another error that I could not fix.


My system has a Kubuntu distribution. Linux 5.4.0-47-generic.