Clonezilla - “Box” is an unknown partition device

I cannot reproduce this bug

Got the error today for the first time (admittedly not from Ubuntu, but from PartedMagic 2015-03-06)

Anyways, I got it reproduced, AND it's (at least in my case) a not-bug.

Steps to reproduce:
- ATA Secure Erase an SSD
- Start Clonezilla without restarting the computer first and without updating the in-kernel partition-list
- The message appears: "Box" is an unknown partition device

Steps to AVOID the message:
- ATA Secure Erase an SSD
- execute "sudo partprobe"
     (notice that the information in /proc/partitions STILL contains the no-longer-existing partitions on the just erased device)
     (think it might be a bug in partprobe? shouldn't that delete non-existing partitions as well as register new ones?)
- use gparted or fdisk to create (at least) an empty partition-table on the device
     (confirm that cat /proc/partitions now shows /dev/sda without any partitions)
- start clonezilla again
    (notice that while the above error-message doesn't appear, clonezilla doesn't see my external harddisk - although I CAN mount the partitions manually *sigh*)
- restart the computer (again with Parted Magic)
- Start Clonezilla again - and notice, the external harddisk STILL doesn't appear....
- give up with PartedMagic and reboot to Clonezilla Live (2.4.2-something)
- finally be able to restore the image

OK, apologies for the lengthy "write as I go" procedure - obviously the middle few steps can be eliminated as they don't work. The main point was: the original "bug" isn't a bug, at least not in clonezilla and not how I used it.

And yes, I did notice that the original submitter said, he wanted to image FROM an SSD, and not TO an SSD, so it might be unrelated after all, however in my case at least, it was easy to circumvent the error-message.

Greetings,
Dweia

Reproduced and solved!! (for me anyway...)

So this is WAY old and probably of little use to anyone anymore, but I just ran into this same issue and was able to resolve it. I get the "box" error any time I tried adding the usb devices after boot. It says you can add them, then wait 5 minutes and press enter. If I add them during that time I get the "box" error. If I boot the computer with all devices already attached then I don't.

Reproduced it on 2 different machines using 3 different connections (directly connected to hard drive, and then two different sata to usb brands). I also reproduced the error whether it was SSD or HHD. This was the only variable. Make sure all devices are already attached when booting if you're getting this error.