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I am now attempting to install Ubuntu 18.04.2 alongside Windows 10. I am unsure of how much space should be set aside for the bootloader partition and swap space partition. Can anybody help me?

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  • Ubuntu now uses a swap file, so no swap partition required. And default install is only / (root) or if UEFI system also an ESP - efi system partition, but it will share Windows ESP if it is UEFI. Most desktops also do not need /boot partition. help.ubuntu.com/community/DiskSpace & askubuntu.com/questions/743095/… & help.ubuntu.com/community/UEFI & askubuntu.com/questions/221835/…
    – oldfred
    Apr 12 '19 at 2:43
  • My desktop is a refurbished Dell Optiplex 3010 DT i5 and might be a little older so I'm not sure I thought it might need a boot partition. By "default install is only root" what exactly do you mean? to oldfred Apr 12 '19 at 8:51
  • Ubuntu has several default install options. Some totally erase a drive, so do not use those. But standard default install only creates / (root). Swap is not created now as it uses a swap file. And if old BIOS that is all you will have on drive, one large ext4 partition used as / (root). Please review disk space link posted above.
    – oldfred
    Apr 12 '19 at 15:14
  • What do you mean by / (root)? and don't I need a boot partition to choose which operating system when I boot up? And I am hesitant to use ubuntus default install because it has erased the windows recovery partition on my laptop because it says the partitions cannot be recognized by ubuntu. Apr 12 '19 at 21:16
  • With Ubuntu there is now only one required partition /. And if you do not turn off Windows fast startup/hibernation. With hibernation flag set, the installer does not see all the NTFS partitions. Some make sure installer sees Windows NTFS partitions. askubuntu.com/questions/843153/… But if you partition in advance, gparted will show NTFS partition, but may flag as hibernated. Then you can create the ext4 partition for / and optionally /home. Then with Something Else you will see your ext4 partition(s) and can choose which is / and if another /home.
    – oldfred
    Apr 12 '19 at 21:48
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Here is what my partitions look like

walt@bat:~(0)$ df -m | grep -E 'sda|Used'
Filesystem          1M-blocks   Used Available Use% Mounted on
/dev/sda5              140435  16124    117156  13% /
/dev/sda7              316201 122259    177859  41% /home
/dev/sda6                 977    143       767  16% /boot
walt@bat:~(0)$ 

so I guess you could use 200 1-M blocks for /boot and 1800 for /.

Swap space should be (Size of RAM) * 1.2 (or *2.0).

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