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I have installed Ubuntu on my external HDD. but my HDD not appear in menu boot. Please help me fix this problem. Tks

thịnh bùi
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    12.04 or 18.04? – DK Bose Mar 12 '20 at 16:10
  • When you reboot your system, did you go to the boot device menu (requires a keystroke which varies depending on your PC BIOS, so I can't tell you what to press because I don't know which PC you have)? If so, what options do you see there? – K7AAY Mar 12 '20 at 16:12
  • yes. I have gone to the boot device menu. and just see internal hdd and usb boot – thịnh bùi Mar 12 '20 at 16:19
  • The following links may help you find the problem: Why Doesn't my Bootable USB Boot and Installation/FromUSBStick and How do I install Ubuntu to a USB key? – sudodus Mar 12 '20 at 16:36
  • Your USB boot option might be your external hard drive, unless you have a usb stick also connected. – crip659 Mar 12 '20 at 16:43
  • IF UEFI, any default install does not create and ESP - efi system partition on any drive other than first drive seen (If none exists) and your should have gpt partitioning. And then Ubiquity installer only uses first drive's ESP. You need to manually create ESP on external drive and reinstall grub or use Boot-Repair to reinstall grub. Posted work around to manually unmount & mount correct ESP during install #23 & #26 https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1396379 & https://help.ubuntu.com/community/Boot-Repair – oldfred Mar 12 '20 at 18:38
  • I fixed the problem with Boot-Repair. and external HDD has appeared in boot menu. thanks a lot – thịnh bùi Mar 13 '20 at 04:41

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