If you want to migrate your e107 Coppermine plugin albums/galleries/images to a NextGen Gallery this works:
I modified the script from this link:
Here's a link to the modified version:
I configured and launched the original script as instructed in the first link. On the first try I got an error that said it was looking for something it did not find, or did not like. So, I stripped whatever it was looking for out of the code. I did this several times and ended up with a modified script that gets the job done.
The modified script will pull images out of each of the e107 user's image folders - something the original script did not do.
You'll end up with galleries you will find and can managed with your NextGen Gallery manager. You will loose some of the information - like who uploaded which photo. But, at least you'll be able to retain all of your photos fairly easily. After you get your photos migrated, you'll need to manage each new gallery to create thumbnails.
I used this with:
Coppermine Plugin 1.3.5
Make backups of your WP database and files before using. Use at your own risk. Good luck :-)