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    uefi

    Hello!
    Am a windows user and wanna try kubuntu (tryed kde neon,fedora)
    the problem
    windows is install on ssd1(1TB)
    kubuntu is install on ssd2(1TB)
    boot is installed on ssd1(windows uefi),whay is not installed in ssd2 on kubuntu

    #2
    Unless you manually create the partitions on ssd2, and use the custom installation options to specify which partitions to use, the installers normally use the existing efi directory if present - this is not wrong or bad.

    There is nothing wrong with sharing the efi partiton with Windows, or other distros even.
    But if you don't you will need to do some manual setup work.


    Some examples of how you can do this.

    https://www.ubuntubuzz.com/2020/09/h...nal-drive.html

    https://www.youtube.com/watch?v=p6Aycry9lFc (not for dual boot, but does show the partitioning steps more clearly)

    You do have to make sure you specify which drive to use for the boot loader files - it won't automatically do that. The images for Step 6 in my first link show this.

    You can do the partitioning from a live session using KDE Partition Manager as well, before starting the installer. Then, all you need to do is assign the correct settings to each one.

    Comment


      #3
      Originally posted by Programinjo View Post
      ...why is not installed in ssd2 on kubuntu
      claydoh's reply is detailed, but I would like to emphasize that with UEFI there's supposed to be only one ESP on a computer, according to the UEFI spec.
      Regards, John Little

      Comment


        #4
        @claydoh

        Thx

        Comment


          #5
          Originally posted by jlittle View Post

          claydoh's reply is detailed, but I would like to emphasize that with UEFI there's supposed to be only one ESP on a computer, according to the UEFI spec.

          Hmmm

          13.3.3
          Number and Location of System Partitions UEFI does not impose a restriction on the number or location of System Partitions that can exist on a system. System Partitions are discovered when required by UEFI firmware by examining the partition GUID and verifying that the contents of the partition conform to the FAT file system as defined in Section 13.3.1.1. Further, UEFI implementations may allow the use of conforming FAT partitions which do not use the ESP GUID. Partition creators may prevent UEFI firmware from examining and using a specific partition by setting bit 1 of the Partition Attributes (see 5.3.3) which will exclude the partition as a potential ESP.

          Software installation may choose to create and locate an ESP on each target OS boot disk, or may choose to create a single ESP independent of the location of OS boot disks and OS partitions. It is outside of the scope of this specification to attempt to coordinate the specification of size and location of an ESP that can be shared by multiple OS or Diagnostics installations, or to manage potential namespace collisions in directory naming in a single (central) ESP.
          So at least I know I have not been doing it wrong all these years

          I do believe that multiple ESPs can be an issue, if they are on the same disk, and Windows is involved. Windows may not like such a layout.

          Comment


            #6
            I didn't catch that either, about only ONE ESP per computer. I don't recall Rod Smith saying that. Anyway, always under the impression you could have as many as you wish. Even on just one disk (although there are other ways of separating/identifying the boot files of different OSs).

            Those interested,
            Dual-booting: How to Use Multiple ESPs
            https://www.kubuntuforums.net/forum/...l=1#post539379
            https://www.kubuntuforums.net/forum/...-fixing-things

            It's not hard to keep them straight. And you set them up in a foolproof way. (When you set up a given ESP to work with a specific OS, you turn OFF the boot flags of all the other ESPs on that system; install that certain OS; then, later, turn all ESPs back on).
            Last edited by Qqmike; Apr 11, 2022, 07:41 PM.
            An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles Bukowski

            Comment


              #7
              Clearly, I was quite wrong, and have been misleading people. What got me going on this is that a lot of people seem to assume "may choose ... on each target OS" is "must choose". My bias against the historic Windows way of doing things has influenced me, I think.
              Regards, John Little

              Comment


                #8
                I fixed the wrong link in post #6.

                Well, we all got some clarity on this, anyway. Nice thing about UEFI is its flexibility. I must confess to never having read the actual UEFI specs, something I suppose I should have done from the get-go. When I wrote the UEFI how-to's for KFN, there were only just a few decent, brief sources on it, mostly on a specific topic. That's all I went by. Rod Smith remains the expert source on it all. Nice guy, he does respond to email questions/issues.
                An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles Bukowski

                Comment


                  #9
                  I am guessing that the spec may have changed. As they tend to do.

                  Originally posted by Qqmike View Post
                  I must confess to never having read the actual UEFI specs
                  Good lord, that beast is quite... hefty

                  Comment


                    #10
                    Well ... then ... I've never even quickly skimmed over it!!! (ok, ok, never, actually, paid much attention to its contents)
                    An intellectual says a simple thing in a hard way. An artist says a hard thing in a simple way. Charles Bukowski

                    Comment


                      #11
                      Originally posted by claydoh View Post
                      Unless you manually create the partitions on ssd2, and use the custom installation options to specify which partitions to use, the installers normally use the existing efi directory if present - this is not wrong or bad.

                      There is nothing wrong with sharing the efi partiton with Windows, or other distros even.
                      But if you don't you will need to do some manual setup work.


                      Some examples of how you can do this.

                      https://www.ubuntubuzz.com/2020/09/h...nal-drive.html

                      https://www.youtube.com/watch?v=p6Aycry9lFc (not for dual boot, but does show the partitioning steps more clearly)

                      You do have to make sure you specify which drive to use for the boot loader files - it won't automatically do that. The images for Step 6 in my first link show this.

                      You can do the partitioning from a live session using KDE Partition Manager as well, before starting the installer. Then, all you need to do is assign the correct settings to each one.
                      what ever do kubuntu instal efi boot on windows dont want that
                      windows must have own efi boot on ssd1
                      kubuntu must have own efi boot on sd2

                      kde neon and fedora work with option use all disk

                      Comment


                        #12
                        Originally posted by Programinjo View Post

                        what ever do kubuntu instal efi boot on windows dont want that
                        windows must have own efi boot on ssd1
                        kubuntu must have own efi boot on sd2

                        kde neon and fedora work with option use all disk
                        Unfortunately with Ubuntu/Kubuntu installers, you must do manual partitioning, there is no way around that.

                        Comment


                          #13
                          Originally posted by claydoh View Post

                          Unfortunately with Ubuntu/Kubuntu installers, you must do manual partitioning, there is no way around that.
                          i do manual partitioning,but kubuntu install efi boot on windows i will try first install kubuntu then windows

                          Comment


                            #14
                            Originally posted by Programinjo View Post

                            i do manual partitioning,but kubuntu install efi boot on windows i will try first install kubuntu then windows
                            If you are doing manual install, if you have set up all partitions correctly, then you just need to select the correct drive as seen here (and noted in my first link):

                            Click image for larger version  Name:	Screenshot_20220412_162404.png Views:	0 Size:	128.0 KB ID:	662190


                            If you are doing this, and it is not working then there is some sort of bug.
                            This is how I do all my Kubuntu installs (always with a separate uefi), for many years now.
                            Last edited by claydoh; Apr 12, 2022, 02:33 PM.

                            Comment


                              #15
                              Originally posted by claydoh View Post

                              If you are doing manual install, if you have set up all partitions correctly, then you just need to select the correct drive as seen here (and noted in my first link):

                              Click image for larger version Name:	Screenshot_20220412_162404.png Views:	0 Size:	128.0 KB ID:	662190


                              If you are doing this, and it is not working then there is some sort of bug.
                              This is how I do all my Kubuntu installs (always with a separate uefi), for many years now.
                              Click image for larger version

Name:	1649856598546.jpg
Views:	108
Size:	101.3 KB
ID:	662201

                              Comment

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