I have a 250 gb hdd and a 1 tb ssd. I currently have ubuntu 18.04 installed. I want to install windows 10 alongside it. I'll be using windows to play games on steam, photoshop and for some hardware which can only use windows. I'll primarily be using ubuntu.

sda             238.5G                                                     
├─sda1 ext4       731M                                                     
├─sda2              1K                                                     
└─sda5 ext4      18.6G /                                                   
sdb             931.5G                                                     
├─sdb1 vfat       512M                                                     
├─sdb2 ext4       732M /media/artemis/b2896d21-6ba9-46fc-99aa-ed497a5998fd 
└─sdb3 swap      14.9G [SWAP]                                              
sr0              1024M    

Any suggestions for how to partition windows 10?

  • Is sdb1 an ESP - efi system partition used for UEFI boot? And are both drives gpt partitioned? Windows only installs to gpt with UEFI and only to MBR for BIOS boot. Best to have both systems in same boot mode. And if newer UEFI hardware better to have both systems using UEFI to boot from gpt partitioned drives. – oldfred May 14 '18 at 14:38
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    Looks like this is a messed up Ubuntu scenario before you've even started on a dual boot. You have Ubuntu installed on both disks. You should first decide which disk for Ubuntu and which one for Windows....or have them both sharing the one disk, with the second disk just for data. Also Windows should always be the first system installed with a dual boot. – Paul Benson May 14 '18 at 15:03
  • how can you tell it's installed on both? any examples of what it should look like? is the ext 4 with 732 m on both? – simetra May 14 '18 at 17:28
  • You have your swap and boot partitions on your 1 TB disk with your root partition on the 250 GB. Since both sda1 and sdb2 are virtually the same small size, I'm guessing sda1 is the original and sdb2/media is sda1 mounted on sdb2. By the way, don't you mean your 250 GB disk is your SSD and the 1 TB is the HDD, just to be clear? – Paul Benson May 14 '18 at 17:58
  • @PaulBenson, yes. I bought this a while ago and forgot. Can you show my a link to a proper dual install of windows and Ubuntu and of the partitioning? – simetra May 14 '18 at 18:10

I did it this way. On the main drive (my SSD) I already had Ubuntu installed.

Ubuntu was on /dev/sda5 inside /dev/sda1 extended partition. When I installed Windows 7, I either had space already unpartitioned on my SSD or I shrunk the extended partition and made unpartitioned space from the remainder.

There is one thing you should keep in mind, let the space you are going to use for the windows install be unpartitioned not already NTFS or anything else.

Boot from the USB/DVD windows installer, install to the unpartitioned space. Windows will create (in my case) /dev/sda2 as its boot partition and /dev/sda3 as its file system partition.

After you are done installing windows, boot up from an Ubuntu live DVD/USB and in the terminal make sure to install grub (boot manager) again to /dev/sda1.

If you do it like this normally you should get a working dual-boot (at least for what I am running Ubuntu 18.04/Windows 7)

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