OK, so you actually have one unencrypted swap partition on an LVM LV:
/dev/mapper/ubuntu--vg-swap_1: UUID="bfa46f63-6942-4d4b-b1ce-b7c3df4f3818" TYPE="swap"
and your /etc/fstab configures just that. But your crypttab configures an encrypted swap device which isn't in fstab:
That's presumably what's causing the password prompt. Let's check which LV dm-1 actually is, can you please get me the output of "ls -lR /dev/mapper"? I am 95% sure it's /dev/mapper/ubuntu--vg-swap_1 and thus this swap partition is used as *both* an encrypted and unencrypted one, and the former fails because of the latter:
mei 11 07:32:36 Denny-HP systemd-cryptsetup[748]: Set cipher aes, mode cbc-essiv:sha256, key size 256 bits for device /dev/dm-1.
mei 11 07:32:36 Denny-HP systemd-cryptsetup[748]: Failed to activate with key file '/dev/urandom': Device or resource busy
So this looks like an LVM variant of bug 953875, not of bug 1447282; this looks independent of GPT.
OK, so you actually have one unencrypted swap partition on an LVM LV: ubuntu- -vg-swap_ 1: UUID="bfa46f63- 6942-4d4b- b1ce-b7c3df4f38 18" TYPE="swap"
/dev/mapper/
and your /etc/fstab configures just that. But your crypttab configures an encrypted swap device which isn't in fstab:
cryptswap1 /dev/dm-1 /dev/urandom swap,cipher= aes-cbc- essiv:sha256
That's presumably what's causing the password prompt. Let's check which LV dm-1 actually is, can you please get me the output of "ls -lR /dev/mapper"? I am 95% sure it's /dev/mapper/ ubuntu- -vg-swap_ 1 and thus this swap partition is used as *both* an encrypted and unencrypted one, and the former fails because of the latter:
mei 11 07:32:36 Denny-HP systemd- cryptsetup[ 748]: Set cipher aes, mode cbc-essiv:sha256, key size 256 bits for device /dev/dm-1. cryptsetup[ 748]: Failed to activate with key file '/dev/urandom': Device or resource busy
mei 11 07:32:36 Denny-HP systemd-
So this looks like an LVM variant of bug 953875, not of bug 1447282; this looks independent of GPT.
Thanks!