Re: Try a partition table manager...
>For others though, it forced their dual boot to stop working.
A real PITA for regular users and yet more reason why they suck balls but I recommend any techie Linux user get comfortable with booting their distro of choice off a LiveCD (should keep one around for emergencies), learning the handful of mount and chroot commands and doing an update-grub or install-grub. Makes this happening go from being a disaster to being a 10 minute pain the ass. Especially since Win10 might do it again with future forced OS upgrades. Of course the other obvious solution is dump Win 10.