Why does Pinta crash immediately after opening an image on Ubuntu 20.04?

Question

When opening pinta on the command line the app quickly crashes after opening an image and complains about a call to free() erroring out before doing a full memory dump.

Answer 1

This is related to What causes Pinta to crash instantly when I begin image selection?

It looks like there's another mono configuration issue in the ubuntu 20 image.

The fix is to upgrade mono to the latest:

sudo apt install gnupg ca-certificates
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo "deb https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update

You can do mono --version to see if this bug affects you or not. I believe the version that ships with Ubuntu 20 is around 6.8.0.105 from memory. After upgrading you'll see 6.12.0.122 or something similar.

Sources:

1. https://www.mono-project.com/download/stable/#download-lin
2. https://bugs.launchpad.net/pinta/+bug/1877235