It doesn't save the image as Andreas state, you need to manually save it from the menu, it's only displayed as rotated but not saved, you might be interested on bug 282548 which is asking for auto saving feature. thanks.
** Changed in: eog (Ubuntu) Status: New => Invalid -- Rotating a read-only image fails silently https://bugs.launchpad.net/bugs/260696 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs