Dual-booting Kubuntu: A summary of your options
https://www.kubuntuforums.net/showth...l=1#post376269
(This material has been incorporated into Section 6 (dual-booting) of the main how-to:
UEFI for Kubuntu--simplified. And ... some dual-booting tips for Kubuntu
https://www.kubuntuforums.net/showth...l=1#post373198 )
Five solutions discussed in detail, for dual-booting LinuxX and LinuxY:
Solution #1: Do nothing special. Use rEFInd.
Solution #2: Do nothing special. Use GRUB2-EFI.
Solution #3: Try to use your UEFI firmware.
Solution #4: Set up separate subdirectories of EFI for LinuxX and LinuxY
Solution #5: Use separate ESPs for LinuxX and LinuxY
If you are new to UEFI, perhaps studying it for the first time, and even though the above topic is the last topic in the last section of the how-to "UEFI for Kubuntu--simplified," you might want to read it first. It will indicate the important points to pay attention to, and, I hope give you some direction, some motivation, for reading the rest of the topics in the how-to.
Regarding the main how-to, "UEFI for Kubuntu--simplified," I went through it and made some minor improvements, corrected a few typos, and addressed the issue of the ESP and the effect of having more than one ESP, adding this text (and text like it):
Technical Note: df /boot/efi will show you the ESP your OS is using.
Most users will have just one ESP and it will usually be sda1 or sda2 (in some Windows systems). If you have more than one ESP, it is not necessarily true that "your ESP is sda1, mounted at /boot/efi." In fact, your ESP may be sda2 in some Windows systems. If you have multiple ESPs, they could be anywhere on your HDD, at any sdxy. That's where df /boot/efi comes in handy. When you boot into an OS, the ESP you are using for that OS will be mounted at /boot/efi. While you are booted into that OS, issue the command at Konsole
to see what ESP partition is mounted for that OS.
I think that just about completes the how-to I had in mind:
UEFI for Kubuntu--simplified. And ... some dual-booting tips for Kubuntu
https://www.kubuntuforums.net/showth...l=1#post373198
Since the subject--UEFI--is new to most people at Kubuntu, I wanted to include some verbiage, some explanations of the basics, and to include a fairly thorough listing of topics. Thus the lengthy text. Ten years from now, most of this material will be obvious or "common sense" to many people. Thanks to Snowhog for accommodating me on an extended word count for the how-to post.
I'm no expert. As I've said elsewhere, I only know what I know; and what I know is what I do and what I read. I've done a lot of experiments, have broken my booting several times, have broken my computer a couple times (even necessitating a CMOS reset :-) ). Do bear in mind that I have only used my ASUS firmware (which is pretty good--it may not be typical), Kubuntu 14.04 & 15.04 tested here (and Mint and Debian), GRUB2-EFI, and rEFInd--that's all, no other bootloaders or Linux OSs (and others, like Fedora, may have its own quirky twists, I'm not real sure). Also, I do not cover Windows--SteveRiley has written good stuff on it here; and google will bring up more for you.
Like this one by Steve:
Dual-booting Kubuntu on a Windows machine
https://www.kubuntuforums.net/showthread.php?65253
https://www.kubuntuforums.net/showth...l=1#post376269
(This material has been incorporated into Section 6 (dual-booting) of the main how-to:
UEFI for Kubuntu--simplified. And ... some dual-booting tips for Kubuntu
https://www.kubuntuforums.net/showth...l=1#post373198 )
Five solutions discussed in detail, for dual-booting LinuxX and LinuxY:
Solution #1: Do nothing special. Use rEFInd.
Solution #2: Do nothing special. Use GRUB2-EFI.
Solution #3: Try to use your UEFI firmware.
Solution #4: Set up separate subdirectories of EFI for LinuxX and LinuxY
Solution #5: Use separate ESPs for LinuxX and LinuxY
If you are new to UEFI, perhaps studying it for the first time, and even though the above topic is the last topic in the last section of the how-to "UEFI for Kubuntu--simplified," you might want to read it first. It will indicate the important points to pay attention to, and, I hope give you some direction, some motivation, for reading the rest of the topics in the how-to.
Regarding the main how-to, "UEFI for Kubuntu--simplified," I went through it and made some minor improvements, corrected a few typos, and addressed the issue of the ESP and the effect of having more than one ESP, adding this text (and text like it):
Technical Note: df /boot/efi will show you the ESP your OS is using.
Most users will have just one ESP and it will usually be sda1 or sda2 (in some Windows systems). If you have more than one ESP, it is not necessarily true that "your ESP is sda1, mounted at /boot/efi." In fact, your ESP may be sda2 in some Windows systems. If you have multiple ESPs, they could be anywhere on your HDD, at any sdxy. That's where df /boot/efi comes in handy. When you boot into an OS, the ESP you are using for that OS will be mounted at /boot/efi. While you are booted into that OS, issue the command at Konsole
Code:
df /boot/efi
I think that just about completes the how-to I had in mind:
UEFI for Kubuntu--simplified. And ... some dual-booting tips for Kubuntu
https://www.kubuntuforums.net/showth...l=1#post373198
Since the subject--UEFI--is new to most people at Kubuntu, I wanted to include some verbiage, some explanations of the basics, and to include a fairly thorough listing of topics. Thus the lengthy text. Ten years from now, most of this material will be obvious or "common sense" to many people. Thanks to Snowhog for accommodating me on an extended word count for the how-to post.
I'm no expert. As I've said elsewhere, I only know what I know; and what I know is what I do and what I read. I've done a lot of experiments, have broken my booting several times, have broken my computer a couple times (even necessitating a CMOS reset :-) ). Do bear in mind that I have only used my ASUS firmware (which is pretty good--it may not be typical), Kubuntu 14.04 & 15.04 tested here (and Mint and Debian), GRUB2-EFI, and rEFInd--that's all, no other bootloaders or Linux OSs (and others, like Fedora, may have its own quirky twists, I'm not real sure). Also, I do not cover Windows--SteveRiley has written good stuff on it here; and google will bring up more for you.
Like this one by Steve:
Dual-booting Kubuntu on a Windows machine
https://www.kubuntuforums.net/showthread.php?65253