One of my favourite desktop applications is LightZone; it’s a digital darkroom that allows me to work with the RAW image format that my Pentax camera produces. In Ubuntu 18.04, it reported the following error on startup after installation, and then did not work correctly with JPEG images:
/usr/lib/lightzone/libLCJPEG.so: libjpeg.so.62: cannot open shared object file: No such file or directory
After doing some research, I discovered a simple command line solution to this problem; I simply opened a terminal window, then entered:
sudo apt-get install libjpeg62:i386
Now everything works as it should.