libopencv-dev and dependencies could not be installed

I am attempting to install howdy, and apt yields this result:

Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 howdy : Depends: libopencv-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

If I try to install directly libopencv-dev it says the same thigs with other packages.

 libopencv-dev : Depends: libopencv-contrib-dev (= 4.2.0+dfsg-5+20.04.sav2) but it is not going to be installed
                 Depends: libopencv-dnn-dev (= 4.2.0+dfsg-5+20.04.sav2) but it is not going to be installed
                 Depends: libopencv-superres-dev (= 4.2.0+dfsg-5+20.04.sav2) but it is not going to be installed
                 Depends: libopencv4.2-java (= 4.2.0+dfsg-5+20.04.sav2) but it is not going to be installed
                 Depends: libopencv-contrib4.2 (>= 4.2.0+dfsg) but it is not going to be installed

Now I haven't done any work with computer vision before, and I've tried pretty much google offered, among which running the command

sudo apt list --installed | grep opencv

Which told me I had installed the following packages

libopencv-core4.2/focal,now 4.2.0+dfsg-5+20.04.sav2 amd64 [installed,automatic]
libopencv-imgcodecs4.2/focal,now 4.2.0+dfsg-5+20.04.sav2 amd64 [installed,automatic]
libopencv-imgproc4.2/focal,now 4.2.0+dfsg-5+20.04.sav2 amd64 [installed,automatic]
libopencv-videoio4.2/focal,now 4.2.0+dfsg-5+20.04.sav2 amd64 [installed,automatic]

As per the guide I found I removed them, ran autoremove, and then retried with howdy. Same result. How do I solve this? It would be amazing to skip some of the password-typing that linux requires.

Edit: as by request, the result of "apt-cache policy libopencv-dev howdy"

libopencv-dev:
  Installed: (none)
  Candidate: 4.2.0+dfsg-5+20.04.sav2
  Version table:
     4.2.0+dfsg-5+20.04.sav2 500
        500 http://ppa.launchpad.net/savoury1/blender/ubuntu focal/main amd64 Packages
     4.2.0+dfsg-5 500
        500 http://it.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
howdy:
  Installed: (none)
  Candidate: 2.6.1
  Version table:
     2.6.1 500
        500 http://ppa.launchpad.net/boltgolt/howdy/ubuntu focal/main amd64 Packages
        500 http://ppa.launchpad.net/boltgolt/howdy/ubuntu focal/main i386 Packages

The result of apt-cache policy is here

I would recommend to purge ppa:savoury1/blender PPA by using below commands:

sudo apt-get update
sudo apt-get install ppa-purge
sudo ppa-purge ppa:savoury1/blender

Then you'll be able to install Howdy from its PPA by

sudo apt-get install howdy