Hello Florian,

> Nov 15 23:53:03 localhost installer[259]: crashing due to uncaught exception: misc-error (#f "~A" ("Device /dev/sda is still in use.") #f) 
> Nov 15 23:53:03 localhost installer[259]: running form #<newt-form 865370> ("Unexpected problem") with 0 clients 

Many thanks (again) for your help here! According to the backtrace you
sent earlier in this thread, it looks like the crash occurs in the
"free-parted" procedure.

This procedure tries to unallocate Parted resources and waits for the
partition table changes to be synchronized to disk. The
"with-delay-device-in-use?" tries 4 times every 250ms to detect if the
device is still in use.

Maybe it takes longer on your HW to synchronize the partition tables. If
you could test the attached patch on top of 1.2.0 it would be terrific.

Thanks,

Mathieu