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Following a SSD malfunction, attempting to boot from an ISO (Ubuntu 18.04.1 LTS) on USB results in the boot agent (Intel GE v1.5.36) taking no action. It lists the USB as an option (as well as the new, blank SSD) and allows the user to toggle to and select it. But this results in a return to the same (device selection) prompt with no other action.

My first thought was that the USB media had been configured incorrectly, so I tried using two different USB drives (and ran through SE questions here, here, and here).

Can anyone think of what might be causing the hangup? ...or does the ISO have to be prepared in some way prior to boot? (It went from the mirror to the drives without modification.)

Drive 1 (ext2 USB)

Thinking it might be a permissions problem, the output of ls -ld /media/user/name1 is

drwxr-xr-x 3 user user 4096 Oct 22 12:32 /media/user/name1

Output of df -hT

/dev/sdb1 ext2 15G 1.9G 12G 14% /media/user/name1

Output of fdisk -l

Disk /dev/sdb: 15.4 GB, 15376318464 bytes

64 heads, 32 sectors/track, 14664 cylinders, total 30031872 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xa399e795

Device Boot Start End Blocks Id System

/dev/sdb1 * 2048 30031871 15014912 83 Linux

Drive 2 (FAT32 USB)

Output of ls -ld /media/user/name2

total 1916400

400 -rw-r--r-- 1 user user 403851 Jan 12 2017 Back Up Your Files to the Cloud.pdf

16 drwx------ 2 user user 16384 Apr 4 2017 SanDiskSecureAccess

8416 -rwxr-xr-x 1 user user 8603432 Sep 20 2016 SanDiskSecureAccessV3.1_win.exe

1907568 -rw-r--r-- 1 user user 1953349632 Oct 22 14:38 ubuntu-18.04.1-desktop-amd64.iso

Output of df -hT

/dev/sdb1 vfat 15G 5.2G 9.2G 36% /media/user/name2

Output of fdisk -l

Disk /dev/sdb: 15.4 GB, 15376318464 bytes

255 heads, 63 sectors/track, 1869 cylinders, total 30031872 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000

Device Boot Start End Blocks Id System

/dev/sdb1 32 30031871 15015920 c W95 FAT32 (LBA)

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    You cannot boot an ISO directly (normally). I do but have to use grub2 and its loopmount command. You use an installer that erases a flash drive, formats it to FAT32, adds boot flag, extracts ISO and adds a BIOS boot loader. The extracted ISO is already configured for UEFI boot. see this: help.ubuntu.com/community/Installation/iso2usb or if you only want UEFI: askubuntu.com/questions/395879/… – oldfred Oct 22 '18 at 21:25
  • @oldfred Thanks; mkusb ended up working well. – Pat W. Oct 23 '18 at 12:26

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