Problem with libpng12-0 - please help me

[Jeffrey Walton]

On Mon, Mar 22, 2021 at 5:30 PM Jan Brøndum Johansson
<insomniacno1 at gmail.com> wrote:
>
> Hello, I followed the instructions on how to install PDF Editor in this article by you https://vitux.com/how-to-edit-pdf-files-in-ubuntu/
>
> Unfortunately this caused me some serious problems on my Xubuntu 16,04 and I'm hoping you will help me get this sorted out.

Ubuntu 16 is kind of old...

I would start by trying to get the machine in a good state:

  $ sudo dpkg --configure -a
  $ sudo apt install -f

followed by:

  $ sudo apt update
  $ sudo apt upgrade

Then, attempt the install.

I would not be surprised if a modern libpng package cannot be
installed on an old Ubuntu. In this case, you might want to build
libpng from sources.

Jeff