HELP Failed Ubuntu installation possibly deleted Windows

Please help, I was trying to install ubuntu alongside windows 10 on my custom desktop. During installation I chose the install ubuntu alongside windows 10 option. The next option was to select drive and allocate drive space. I chose the C drive were Windows 10 was installed, and distributed the disk space equally for both windows and ubuntu. Later, I pressed continue, it started to process and it gave me a fail message which I can't remember which one. Later, it was late at night so I decided to try installation next day. Next day I booted my pc and windows was gone from the boot manager. This seemed strange as I never got to commence ubuntu installation, I assumed my boot manager was broken. I tried repair my pc option, I tried command prompts that can fix the boot manager that I found searching online, nothing fixed it. I took my pc to a repair shop and they told me my windows partition was deleted. This seemed so strange, how can I have deleted my windows partition if I never fully installed Ubuntu in the first place? Did I actually deleted it and I have to reinstall it? What can I do? Please help

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Since installing any OS can be risky.

This is why you read about backup before doing this. I usually boot my Linux CD/DVD/USB to look over the HDD and see if it is indeed gone. This is really old advice about just trying it first without installing. No Linux learning involved as I noted at

So boot some distro, run it in its Live mode and look around.

If it is all gone. Use the machines factory restore or your last backup.

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Thanks, I was trying to be careful and thought since I didn't statt installation, nothing would happen to windows. I will follow your advise. Thank you

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The steps you described
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One last question

Thank you, one last question. If I chose the "install ubuntu alongside windows", I thought that would secure windows from being deleted and allow for dual-boot. Is it really possible to delete windows partition with the dual boot option?

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I know this will sound badly no matter how I write it.

The install ubuntu alongside windows works smoothly 99.9% of the time. There can be machines that just lose it when the partitions are moved around. I know of a few Dells that I can only tell you about the fallout. It looks like Dell may have used Drive Image 7 or such to implement recovery and updates to the OS or a Linux alongside install blows up.

Microsoft didn't account for this and Ubuntu might not either.

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what Rob said

and " it gave me a fail message which I can't remember which one."

I sure wish you'd written it down. Can you boot to the Ubuntu LIVE DVD and run the GParted program, make a screen capture of it for that drive (be sure you are on the drive and not some USB flashdrive) and post it here?

Also, did you make sure to run the 64 bit installation for Ubuntu instead of a 32 bit type? I'm assuming your Windows 10 was installed as 64 bit, probably on GPT partitioned drive too.

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Don't do it

Spend 80 bucks and put Ubuntu on an SSD by itself. Do both installations with one drive connected at a time and don't use some common boot manager. Set up your boot order to have your primary OS on top and the other next. Use the appropriate function key to bring up the boot options if you want to use the second choice OS. If you want to do backups using disk imaging, this is almost failsafe. I have a PC with Win 7 and Linux Mint both on separate SSD drives. It's built with an older Asus board with UEFI. I boot to desktop with either in about 15 seconds. Best thing since raisin bread...

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If you have a 16-32 GB flashdrive, you can get a lot of mileage running Ubuntu on that as a compressed install using persistence, easy in windows to setup using the site and it's Universal USB Installer program. Easiest method for "linux newbies" to get started in linux.

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