Comment 7 for bug 1685794

I've got a similar issue in that there's a pause of around 90 seconds during boot, though the messages either side of the pause are different. Thing is, there's no way of knowing whether the messages either side are even relevant - I can't believe that an almost identical length pause is not related to this issue though. I'm using 17.04 that was upgraded, though after the upgrade I also swapped the motherboard/processor to an Asus Prime X370-Pro and Ryzen 7 1700. I'm now using mainline kernel 4.11.0-041100-generic but the delay was also there with the stock 4.10.

The messages either side of the pause for me are:

[ 11.667273] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.1/0000:28:00.1/sound/card0/input15
[ 11.667317] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.1/0000:28:00.1/sound/card0/input16
[ 11.667350] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.1/0000:28:00.1/sound/card0/input17
[ 11.971125] input: gspca_zc3xx as /devices/pci0000:00/0000:00:07.1/0000:29:00.3/usb5/5-2/5-2.4/input/input18
[ 11.971454] usbcore: registered new interface driver gspca_zc3xx
[ 12.022162] usbcore: registered new interface driver snd-usb-audio
[ 101.921672] IPv6: ADDRCONF(NETDEV_UP): enp38s0: link is not ready
[ 101.923166] NVRM: Your system is not currently configured to drive a VGA console
[ 101.923168] NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
[ 101.923168] NVRM: requires the use of a text-mode VGA console. Use of other console
[ 101.923169] NVRM: drivers including, but not limited to, vesafb, may result in
[ 101.923169] NVRM: corruption and stability problems, and is not supported.
[ 101.923846] nvidia-modeset: Allocated GPU:0 (GPU-69ab0986-ebf2-246d-307c-7267ee509b56) @ PCI:0000:28:00.0
[ 101.947753] IPv6: ADDRCONF(NETDEV_UP): enp38s0: link is not ready
[ 101.979165] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 101.993045] Ebtables v2.0 registered
[ 103.244058] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 103.306651] kvm1e2-kvm2e3: port 1(kvm1e2-k2e3-nic) entered blocking state
[ 103.306653] kvm1e2-kvm2e3: port 1(kvm1e2-k2e3-nic) entered disabled state
[ 103.306719] device kvm1e2-k2e3-nic entered promiscuous mode

The Nvidia warnings are irrelevant - I've just changed my console resolution to 1280x1024 which the nvidia drivers moan about, but the pause was there before doing that.

I've tried disabling on-board audio ( it's an S1220A ) and the USB 3.1 chip, because they're fairly new and I thought one of them may be the problem... but neither made any difference.