Cannot open .jpg, .png, or .tif files with ImageMagick, only .gif files work

I am using Ubuntu 18.04.1 LTS (Bionic Beaver) on Windows Subsystem for Linux. I installed ImageMagick according to these instructions, the only exception being ImageMagick version is currently 7.0.10-34, not 7.0.4-5: https://www.tutorialspoint.com/how-to-install-imagemagick-on-ubuntuapkgily.

I've downloaded a test .gif and successfully run commands like convert giphy.gif -flip new.gif and magick giphy.gif giphy.tif and identify giphy.gif, but when I try to run the same commands with "panda.jpg"