I got the same message from the bug description.

During the dist-upgrade, I noticed quite a few GdkPixbuf-WARNING errors
logged, e.g.:

(frontend:20874): GdkPixbuf-WARNING **: 23:46:47.169: Cannot open pixbuf
loader module file '/usr/lib/x86_64-linux-gnu/gdk-
pixbuf-2.0/2.10.0/loaders.cache': No such file or directory

I found a way to fix my upgraded system, and it might help you as well.
See the instructions below.

-----------------------

# first, check if the following command produces any output
sudo egrep "WARNING.*pixbuf" /var/log/dist-upgrade/apt-term.log

# if the command above produces any output, then the commands below
might fix your broken 19.04 installation.

# I'm not sure if these three commands were necessary to fix the system, but 
they should do no damage:
sudo apt install libgdk-pixbuf2.0-dev
sudo mv /var/lib/dpkg/info/install-info.postinst 
/var/lib/dpkg/info/install-info.postinst.bad
sudo apt-get install --reinstall install-info

# and this will fix the packages that were not installed properly because of 
the install-info error:
# explanation:
#   select only the lines containing 'Setting up' or 'WARNING.*pixbuf',
#   then select only the lines containing 'pixbuf' together with the 'Setting 
up'
#      line directly preceding it (with -B1), and discard other 'Setting up' 
lines
#   then select only those 'Setting up' lines
#   in other words, select all 'Setting up' lines that resulted in that WARNING 
message.
#   then, select the package name (third word) from those lines with awk,
#   and reinstall those packages.
for X in `sudo less /var/log/dist-upgrade/apt-term.log | egrep "Setting 
up|WARNING.*pixbuf" | grep -B1 pixbuf | grep Setting | awk '{print $3}'`; do 
echo REINSTALLING: $X; sudo sudo apt-get --reinstall install $X; done

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https://bugs.launchpad.net/bugs/1825425

Title:
  Upgrade Failure, Ubuntu 18.10 to 19.04

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