cant boot from usb

I used the command line instructions on making a bootable 8.10 usb
zcat .gz to entire drive /dev/sdb so I wouldn't need to put a mbr on it
tried to boot from it but it gives error message
is there something I'm forgetting to do?

There are a few machines

There are a few machines that will not boot from a usb pen drive. You can try to make a partition table on it and then put on an MBR - that may help. But the opposite can also be true. My Acer laptop's motherboard prevents booting from a USB stick, but using the entire pen drive without a partition table or MBR circumvents that restriction.

I'm attempting this on a

I'm attempting this on a Dell mini9
I've been able to make an Ubuntu LiveUSB stick and boot from that so I know I can boot from USB

more detail:
(following instructions for 8.04)
when I do an apt-get for the mbr it says 'mbr is already the newest version' and does not download it - which makes sense
so then when I do sudo mbr-install to dev/sdb
it says there is no 'mbr-install' command

when I apt-get 'mbr-install' comes back with the error message 'couldn't find package mbr-install'
suggestions, tips, enlightenment appreciated!

The command is sudo

The command is
sudo install-mbr /dev/sdb

not

mbr-install /dev/sdb

I make that mistake all the time...

~$ dpkg -L mbr
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/mbr
/usr/share/doc/mbr/README
/usr/share/doc/mbr/NEWS
/usr/share/doc/mbr/README-1st.Debian
/usr/share/doc/mbr/copyright
/usr/share/doc/mbr/AUTHORS
/usr/share/doc/mbr/changelog.gz
/usr/share/doc/mbr/changelog.Debian.gz
/usr/share/man
/usr/share/man/man8
/usr/share/man/man8/install-mbr.8.gz
/sbin
/sbin/install-mbr

yup I was doing this as root

yup I was doing this as root

ah wait mbr-install I'll try

ah wait mbr-install
I'll try that
dyslexics untie!
;)

you also might want to fix

you also might want to fix your instructions on the 8.04 page:

//If the device does not boot, try installing an MBR onto the USB drive:

sudo apt-get install mbr

sudo mbr-install /dev/sdX # Pick the correct device!
//

which have it the other way round
as per your last post:

//
The command is
sudo install-mbr /dev/sdb
//