I scanned an old image using my Epson NX515 printer, used GIMP to make some minor repairs on the image and printed it out. I noticed there were a number of evenly spaced thin blue lines across the image, approximately six of them.

Question

I scanned an old image using my Epson NX515 printer, used GIMP to make some minor repairs on the image and printed it out.  I noticed there were a number of evenly spaced thin blue lines across the image, approximately six of them. I opened & printed the image on my PC using PAINT.NET.  No lines appeared. I sent the image to my daughter. She printed it and found no lines. I printed the image using Seahorse on my Mac and the lines still appeared. I used basically the same print settings on Mac and PC.

Answer 1

maahes wrote:
did so now, only now I'm getting a slightly different error: could not find udevd no such file or directory. I checked both grub.cfg's and my mkinitcpio.conf and there's no listing for udevd ....which I've never heard of, so I assumed it was a typo?
For clarification: udev is in the mkinitcpio.
I'm not sure whether I yet have a good intuition for how you have your machine set up, but I suspect you need to include a cryptdevice flag to the kernel in your grub config. The file isn't found because the kernel doesn't know your root directory needs decrypting first.
My setup is an LVM over LUKS over LVM sandwich. To boot into my system, the grub.cfg contains the line:
linux /vmlinuz-linux root=/dev/mapper/cryptvg-root cryptdevice=/dev/mapper/vg-crypt:root rootfstype=ext4 pcie_aspm=force acpi_osi=Linux acpi_backlight=vendor i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 ro
Now, most of those flags don't have anything to do with your problem, but note the cryptdevice. It tells the kernel it's dealing with an encrypted filesystem sitting in a logical volume called crypt on a volume group called vg. The bit after the colon tells the kernel to associate this encrypted filesystem with /dev/mapper/root.
As for how to fix your system, I'm afraid I still feel a bit fuzzy about how your LVM and encrypted layers relate to each other, whether you have LVM over LUKS, or LUKS over LVM, or something else. Was there a particular how-to that you followed?