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I have a 480GB SSD split into two partitions, denoted as (C:) and (D:).

My objective is to eliminate Windows from the (C:) partition.

Subsequently, I aim to install Ubuntu in its place, ensuring all data remains intact on the (D:) backup partition.

How can I achieve this?

Consider /dev/sda3 is (C:)

Consider /dev/sda5 is (D:)

enter image description here

Cristina Pereira Cunha
  • 101
  • You can use the Something else or Manual Partitioning option to tell the installer exactly what you want. You didn't provide Ubuntu product or release details; as some releases (eg. Ubuntu 23.10 Desktop) provide different ISO choices that use different installers, meaning how the detail is presented on screen varies on your installer (Ubuntu offers 3 installers; 1 for Server, 2 for Desktop, with flavors also using others). If your system is uEFI you'll need to have an ESP, and you can just use your old C as the "/" partition if you wish. – guiverc Mar 02 '24 at 05:25
  • If it was me doing the install, I'd just ignore the sda5/D partition as for install, and add an entry for that after your system is installed (ie. add it to your file-system table for example). My guess is your picture is showing a ubiquity installer picture, but sorry I see installers so often I can't always reliably pick one from another (thus assume nothing unless specifically told and you didn't mention product/release) – guiverc Mar 02 '24 at 05:27
  • Just format sda3. Don't create a new partition table. Make sure nothing changes or is selected for sda5 – Daniel T Mar 02 '24 at 05:40
  • Not a good idea to leave d: as NTFS. You can only repair it from Windows. It will eventually need chkdsk and defrag from Windows. And good backups required, before doing anything major like this. If only using Ubuntu use Linux formats like ext4. If you do leave it make sure Windows fast startup is off, so hibernation flag not set. We see many where a NTFS is left hibernated & then the Linux NTFS driver cannot mount read/write. https://askubuntu.com/questions/145902/unable-to-mount-windows-ntfs-filesystem-due-to-hibernation – oldfred Mar 02 '24 at 15:14

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