John,
Glad to give the exact steps that work for me. I have now used this to
produce 5 or 6 bootable USB's and the process is quite reliable for me.
One thing I have not successfully done is increase the size of persistent
memory beyond the 4 GB size limitation. There are a number of posts
different places with several methods for accomplishing this. However, I
haven't gotten any of them to work for me. However, I haven't been able to
spend much time on that. Perhaps someone can complement this post with some
steps on how to increase the size of the persistent memory. That would be
very useful now that larger USB drives are so inexpensive.
Getting Persistence
Although the UNetbootin process is supposed to result in a drive that has
persistence, meaning it will keep changes and saved files between boots,
this was not found to be the case on the HP Envy laptop used in this
exercise. The reason is not entirely clear, although it may be due to
different boot software and file formats used in different systems. Perhaps
other combinations will work without a problem, but that wasn't what was
found with this combination.
To enable persistence the 'grub.cfg' in the /boot/grub directory of the USB
drive must be modifed. The word 'persistent' but the inserted before the
'file=...' in the places. See the resulting 'grub.cfg' file below with the
addition highlighted.
Figure 3 - The grub.cfg file must be modified to enable persistence
if loadfont /boot/grub/font.pf2 ; then
set gfxmode=auto
insmod efi_gop
insmod efi_uga
insmod gfxterm
terminal_output gfxterm
fi
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
menuentry "Try Ubuntu without installing" {
set gfxpayload=keep
linux /casper/vmlinuz.efi persistent
file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash --
initrd /casper/initrd.lz
}
menuentry "Install Ubuntu" {
set gfxpayload=keep
linux /casper/vmlinuz.efi persistent
file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash --
initrd /casper/initrd.lz
}
menuentry "OEM install (for manufacturers)" {
set gfxpayload=keep
linux /casper/vmlinuz.efi persistent
file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity quiet splash
oem-config/enable=true --
initrd /casper/initrd.lz
}
menuentry "Check disc for defects" {
set gfxpayload=keep
linux /casper/vmlinuz.efi boot=casper integrity-check quiet
splash --
initrd /casper/initrd.lz
}
Best Regards,
Stephen Berger
From: John Petrich [mailto:[email protected]]
Sent: Sunday, February 14, 2016 12:43 PM
To: [email protected]
Subject: Modified USB boot config
Stephen,
Read your post on Discuss GNU Radio about enabling persistence mode on a
bootable USB stick Would you mind outlining the exact steps? Many of us
are having the exact same problem that the Unetbootin persistence partition
doesn't persist.
Regards,
John Petrich
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