Fix-Broken Install message in Linux

I usually see this when you mix repositories that aren't compatible with each other or when trying to manually install a package without all the dependencies...
What distro is it?

First just execute the command provided in the error message...

apt --fix-broken install

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And as Scott mentions, likely you have mixed repositories (2x+ different Distro repositories setup). If you do have mixed repositories, no command will help. You'll have to fix this problem before taking any other action... or all other actions will likely fail in odd ways.

What seems to have happened... Just a guess, as there's no system data...

1) You were running Ubuntu Bionic (18.04) to start.

2) Then someone has enabled a Ubuntu Focal Fossa (20.04) repository, which is where all 5.X Kernels will live.

3) Then some sort of update or specific install was attempted with the 5.X Kernel, specifically the 5.3.0-28-generic Kernel version.

Note: You must be very careful at this point. If your machine attempts a reboot before this problem is fixed, there's a chance your machine will brick (become unbootable), so let's go through the fixes.

First step will be for you to provide the following data.

dpkg -l | egrep "linux.*generic"

find /etc/apt -type f -exec egrep -il Focal {} \;

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This returned data will likely provide next steps.

Here's a guess at your next steps (guessing without data).

1) Manually remove all 5.0.3 Kernel packages.

2) After #1 is complete, be very careful to make sure you have a bootable 4.15 Kernel (Bionic Kernel version) correctly installed. You'll do this by checking your dpkg output which should look similar to this...

net15 # dpkg -l | egrep "linux.*generic" | awk '{ print $2 }'
net15 # dpkg -l | egrep "linux.*generic" | awk '{ print $2 }' | grep 76
linux-image-4.15.0-76-generic
linux-modules-4.15.0-76-generic
linux-modules-extra-4.15.0-76-generic

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If you don't have at least 1x full Kernel installed, you must manually install at least 1x working Kernel.

I suggest 4.15.0-76 as this is the latest stable Bionic Kernel.

3) Refer to the find output from the above command. If you find any APT repository files containing Focal, remove them all, then do the following...

apt-get update

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To remove all Focal cruft from the APT/DPKG caches.

4) Now the important step, run this command...

update-grub2

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This command must run cleanly, before you attempt a reboot, to ensure reboots work.

I reinstalled the system perhaps this would have worked.