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Re: USB Install Fails, Complains about CD-ROM

On Fri, May 11, 2018 at 3:38 PM, Thomas Schmitt <scdbackup@gmx.net> wrote:

Kent West wrote:
> > I learned that EFI boot drives need to have a GPT partition table.

No. They do not. An MBR partition of type 0xEF is well ok, too.

> > discovered that the flash drive had a "mac" partition table.
> > Wha-a-ah-h-h??

It has an MBR partition table with partition 2 having type 0xEF,
an invalid GPT, and a useless Apple Partition Map.

Pascal Hambourg wrote:
> It also has Apple and GPT partition tables, but they are bogus

The GPT is not valid because there is a non-"protective" MBR partition
table. The APM is valid, but should be of no interest for any firmware
that does not expect a HFS or HFS+ filesystem. (And there is no such
filesystem in the ISO image.)

Kent West wrote:
> > So I ran gparted, selected the drive, and created a new "GPT"
> > partition table, then repeated all my former steps, and bang! Success!

Pascal Hambourg wrote:
> Copying the image again overwrote the GPT partition table and anything else
> you may have written to the stick. So it does not explain the success. You
> may have done something wrong the first time.

I agree that repeating
overwrites the main GPT and the protective MBR partition table.
It does not overwrite the backup GPT at the end of the storage medium.

Does the usable USB stick report again the Apple Partition Map ?


westk@westkent:~/Downloads$ sudo parted --list
Model: ATA CT960BX200SSD1 (scsi)
Disk /dev/sda: 960GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system     Flags
 1      1049kB  15.0GB  15.0GB  primary   ext4            boot
 2      15.0GB  960GB   945GB   extended
 5      15.0GB  35.0GB  20.0GB  logical   ext4
 6      35.0GB  45.0GB  9999MB  logical   ext4
 7      45.0GB  65.0GB  20.0GB  logical   ext4
 8      65.0GB  70.0GB  4999MB  logical   ext4
 9      70.0GB  928GB   858GB   logical   ext4
10      928GB   960GB   32.0GB  logical   linux-swap(v1)

Model: ATA ST1000DM003-1CH1 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  1000GB  1000GB  primary  ext4

Warning: The driver descriptor says the physical block size is 2048 bytes, but
Linux says it is 512 bytes.
Ignore/Cancel? i                                                          
Model:  USB Flash Drive (scsi)
Disk /dev/sdc: 62.7GB
Sector size (logical/physical): 2048B/512B
Partition Table: mac
Disk Flags: 

Number  Start   End     Size   File system  Name   Flags
 1      2048B   6143B   4096B               Apple
 2      3693kB  4119kB  426kB               EFI

Kent West wrote:
> With my first attempt, the "cp" happened very quickly. [...]
> With the second attempt, the "cp" took minutes

Well, copying a CD sized image at 10 MB/s should take a bit more than a
minute. "Very quickly" sounds suspicicious.

But if only a few MB were copied (for what strange reason ever) there
remains the riddle why it booted and probably loaded the initrd.
Why does it fail when it looks for the ISO filesystem ?

It would be helpful to know where exactly the installation startup
failed with what message exactly.

I no longer have a failing setup, but this Ubuntu user was seeing the exact same thing I was seeing, except in Debian words/colors:


In case of link-rot, here's what he writes:

  1. The computer boots up the installation process ok.
  2. It gets through the Ubuntu language, locale and keyboard selection.
  3. Then starts loading additional components. At this point it gets about a quarter of the way through then throws big error message saying:

[!!] Load installer components from CD

There was a problem reading data from the CD-ROM. Please make sure it is in the drive. If retrying does not work., you should check the integrity of your CD-ROM.

Failed to copy file from CD-ROM. Retry?

Have a nice day :)

Thanks! You, too! 


Kent West                    <")))><
Westing Peacefully - http://kentwest.blogspot.com

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