Thanks for your reply, which I just saw.  I feel rather foolish now...  I 
was in fact mounting /dev/usb, rather than /dev/usb2 (there is actually a 
file called BOOTX64.cfg in both partitions, but the one in /dev/usb is read 
only, even though the owner of the file (me) has read and write 
permission.  The file in /dev/usb2 has no such restrictions and I could 
edit it without problems, so I commented out the lines referring 
to noexitboot and  mapbs.  As soon as I have access to the other laptop 
I'll see if it has made any difference.

Many thanks for your help.

Andrew

On Saturday, 7 December 2019 13:12:34 UTC, Claudia wrote:
>
> AndrewS: 
> > Good evening 
> > 
> > First post here... 
> > 
> > I made a bootable USB istaller for Qubws 4.0.1 using the dd comand in 
> Linux 
> > Mint 19.2.  This gave me a USB stick that booted OK on the (rather old, 
> and 
> > totally unsuitable for Qubes I know) laptop I made it on.  When I tried 
> the 
> > stick in a more modern laptop, it wouldn't boot, stalling on a panic in 
> > core 1.  There is a suggestion in the documentation on the Qubes site to 
> > edit out a couple of lines in BOOTX64.cfg, but all the files on the 
> > installation stick are read-only. 
> > 
> > Suggestions on how to proceed would be appreciated. 
> > 
> > Thanks in advance. 
> > 
>
> Welcome to the list. Sorry for the delay, I must have missed this 
> somehow. Can you post a copy of the terminal (commands and their output) 
> when you try to modify the files? 
>
> If you're getting "Read-only filesystem" make sure you're mounting the 
> first partition (EFI system partition) as fat32. Do not mount the entire 
> device as an ISO filesystem. For example, you want to mount /dev/sdb1, 
> not /dev/sdb. 
>
> If Gnome auto-mounts the drive when you insert it, try ejecting 
> (unmounting) it and then mount it manually. 
>
> Make sure you're running as root. If you're getting "Permission denied", 
> you probably just need to `chmod u+w /path/to/file`, edit, and then 
> `chmod u-w /path/to/file`. 
>
>
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