On Tuesday, 23 September 2025 15:54:26 British Summer Time Dr Rainer Woitok 
wrote:
> Greetings,
> 
> just starting  a routine upgrade  I found the following  in the "emerge"
> output:
> 
>    !!! The following installed packages are masked:
>    - sys-boot/unetbootin-702::gentoo (masked by: package.mask)
>    /var/db/repos/gentoo/profiles/package.mask:
>    # Andreas Sturmlechner <[email protected]> (2025-09-16)
>    # Abandoned upstream, based on Qt5, "must be run as root", then fails to
>    # start w/ current kde-plasma/kdesu-gui[X] within Wayland sessions too.
>    # Removal on 2025-10-16. Bug #957179
> 
> In the past I used this package to update the bootable image on my reco-
> very USB stick, but now this no longer seems to be a good idea :-(
> 
> What are others using to create a bootable USB stick?
> 
> Sincerely,
>   Rainer

I've never used unetbootin, but if it just burns an ISO file on a USB device, 
then dd which I use frequently should achieve the same, e.g.:

dd if=my_ISO_file of=/dev/sdc bs=1M conv=fsync status=progress

where /dev/sdc is the USB device.  See below for details:

https://wiki.gentoo.org/wiki/LiveUSB

I have also used k3b on Plasma/KDE, by selecting Tools > Burn Image.

If you do not have an ISO fs and therefore you need to create it first with 
squashfs, grub or syslinux, etc. before you transfer it over to the USB 
device, take a look here:

https://wiki.gentoo.org/wiki/Install_Gentoo_on_a_bootable_USB_stick

For creating custom Gentoo ISOs, perhaps to match a different arch, you could 
take a look at the  dev-util/catalyst tool:

https://wiki.gentoo.org/wiki/Catalyst

HTH

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