WSL?
LD_LIBRARY_PATH is an environment variable that tells the OS where it can find linked libraries. One solution would be to create a symlink from the current file to where the app expects it to be:
#: ln -s /lib/x86_64-linux-gnu/libMagick++-7.Q16HDRI.so.5 /usr/local/lib/libMagick++-7.Q16HDRI.so.5
'/usr/local/lib' might not exist so another solution would be to export '/lib/x86_64-linux-gnu' to the environment with:
$: export LD_LIBRARY_PATH="/lib/x86_64-linux-gnu"
tbh I don't know what would be best for you in this instance, as I have to confess that I am not familiar with how Ubuntu structures its data. If you try either of those methods and nothing works I will post the next Windows build tomorrow (29/07/22.) It is relatively stable now that I have sorted a few of the spooky bugs (really weird one involving co-ordinates when selecting tiles.)