hi. so, i've tried multiple solutions on these forums to fix my problems with ubuntu 14.04.3 - which share my hdd with windows 10.
my problem is that windows 10 doesn't seem to recognize ubuntu as an operating system. it goes straight to windows on boot - but it could recognize a program like unetbootin before. ubuntu is successfully installed on my laptop - it is residing in a 200gb partition with about 5gb of swap area. windows 10 is allocating about 600gb on my other partition, and i'm saving 50gb or so for a future mac os x or linux distro.
i have a dell inspiron 15 i5558 with 1tb hdd. primarily runs windows 10, hoping to tri-boot mac os x (yosemite or el capitan), win10, and ubuntu 14. i need to be able to do this for my school's robotics program (i'm on the programming/CAD team), and we are using windows and linux for programming, mac os x so it is compatible with ipads/airplay.
if it helps, ubuntu also didn't recognize win10 during the installation process, which is why i had to manually set up my partitions (which, honestly, was no hassle).
but, here is what i have tried to do so far to get this to work:
1) reinstalling multiple times. the first time, it said i installed ubuntu on legacy boot. so, i reinstalled that onto uefi boot, but windows doesn't recognize it still. the installations were successful each time with no errors, and updates were downloaded during the installations. i installed from a boot disk (i don't have a usb), and i had difficulties with the wubi.exe installer before, but windows recognized it then but would not launch it.
2) boot repair via linux terminal. i started up from disk, and then selected the "try linux" option. i ran boot repair, but it failed and would not fix the recommended method because i run from uefi boot. that is when i reinstalled ubuntu after i remembered i installed it on legacy boot. still did not work.
3) windows control panel > boot manager. i tried seeing if windows recognized ubuntu as an operating system also residing within my laptop, and it did not.
4) creating/deleting/formatting partitions. i reformatted the partitions ubuntu was previously installed on, and deleted unnecessary partitions, while creating a new one for the swap area. windows recognizes the partitions as allocated, but does not recognize ubuntu on them.
any suggestions would be greatly appreciated - at this point, i will be willing to try anything. thank you very much! (: