Added -f to rm because file might not exist

assemble_image.sh

@@ -25,7 +25,7 @@ rm -rf "$workspace/part_files"/grub
 
 cp "$iso_file" "$workspace/part_files/kubuntu.iso"
 
-rm "$workspace/part.img"
+rm -f "$workspace/part.img"
 truncate -s "$image_size" "$workspace/part.img"
 mkfs.vfat -n "LIPSTICK" "$workspace/part.img"
 MTOOLS_SKIP_CHECK=1 mcopy -i "$workspace/part.img" -b -s -v "$workspace/part_files"/* ::