Upgraded from 12.6.9 to 12.7.1 on ubuntu 20.04 and no longer able to make persistent ubuntu usb stick for ubuntu 21.04 fails to boot

I had made numerous bootable drives using 12.6.9 on ubuntu 20.04 for ubuntu 21.04 but attempting the same now after updating to 12.7.1 results in a usb stick that fails to boot.

The ubuntu disk iso used is the following
"ubuntu-21.04-desktop-amd64.iso"

Both micro sd card used tested in the usb adapter were working with teh 12.6.9 version.

The last message shown on the computer that fails to boot is.
"integrity: Problem loading X.509 certificate -65"

But from what I understand this is a normal error when booting Ubuntu and can be ignored.
Infact I think the error even flashes on the screen on the bootable drives I still have that work that I made with 12.6.9.

I really need to downgrade to 12.6.9 (for this and all related packages) as 12.7.1 isn't working for making persistent bootable usb disks for me, but this and the other mkusb related PPA's don't have the last working version, they only has the current version.

```
apt-cache showpkg mkusb
Package: mkusb
Versions:
12.7.1-1ubuntu1 (/var/lib/apt/lists/ppa.launchpad.net_mkusb_ppa_ubuntu_dists_focal_main_binary-amd64_Packages) (/var/lib/apt/lists/ppa.launchpad.net_mkusb_ppa_ubuntu_dists_focal_main_binary-i386_Packages) (/var/lib/dpkg/status)
 Description Language:
                 File: /var/lib/apt/lists/ppa.launchpad.net_mkusb_ppa_ubuntu_dists_focal_main_binary-amd64_Packages
                  MD5: 06649dbfbdf851ca68ba1b78a9b467eb
 Description Language: en
                 File: /var/lib/apt/lists/ppa.launchpad.net_mkusb_ppa_ubuntu_dists_focal_main_i18n_Translation-en
                  MD5: 06649dbfbdf851ca68ba1b78a9b467eb

Reverse Depends:
  mkusb-common,mkusb 12.5.7
  mkusb-common,mkusb 12.5.7
Dependencies:
12.7.1-1ubuntu1 - gdisk (0 (null)) pv (0 (null)) xterm (0 (null)) wmctrl (0 (null)) zenity (0 (null)) rsync (0 (null)) mkusb-common (2 12.7.1) guidus (2 12.7.1) mkusb-nox (0 (null)) mkusb-plug (2 12.7.1) usb-pack-efi (2 12.7.1)
Provides:
12.7.1-1ubuntu1 -
Reverse Provides:
```

Is there anyway you could re-upload so I can make bootable persistent usb sticks again.

If you require any further information let me know, Thankyou.