I did the following:
1. Pinta uninstall WebP plugin and closed down Pinta.
2. Install WebP: sudo apt-get install webp
3. Open Pinta and install WebP plugin.
4. Close Pinta and reopen it (don't know if this is required).
5. File | Open and "Could not load WebP library" pops-up again.
I did the following:
1. Pinta uninstall WebP plugin and closed down Pinta.
2. Install WebP: sudo apt-get install webp
3. Open Pinta and install WebP plugin.
4. Close Pinta and reopen it (don't know if this is required).
5. File | Open and "Could not load WebP library" pops-up again.