Urgent -18.04 auto updated to 18.10 how to downgrade

I’m at a loss. After running an apt-get update / upgrade, login message said to reboot. I rebooted and my VMs will not boot with error:

root@srv01kvm01:/var/lib/libvirt/images# virsh start bs01
error: Failed to start domain bs01
error: internal error: qemu unexpectedly closed the monitor: 2018-08-28T21:19:24.892135Z qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.80000001H:ECX.svm [bit 2]
Could not read keymap file: 'en-us'

Looked to the top and I saw Cosmic Cuttlefish 18.10 :exploding_head:

“var/log/apt/history”

Start-Date: 2018-08-28  05:02:30
Commandline: apt-get upgrade
Requested-By: mpadmin (1000)
Upgrade: debconf:amd64 (1.5.66, 1.5.69), libgssapi3-heimdal:amd64 (7.5.0+dfsg-1, 7.5.0+dfsg-2), libjson-glib-1.0-0:amd64 (1.4.2-3, 1.4.2-4), manpages:amd64 (4.15-1, 4.16-1), perl-base:amd64 (5.26.1-6ubuntu0.1, 5.26.2-7), libnginx-mod-http-geoip:amd64 (1.14.0-0ubuntu1, 1.15.2-0ubuntu2), libpolkit-gobject-1-0:amd64 (0.105-20, 0.105-21), seabios:amd64 (1.10.2-1ubuntu1, 1.11.1-1), libguestfs-hfsplus:amd64 (1:1.36.13-1ubuntu3, 1:1.36.13-1ubuntu3.1), libusb-1.0-0:amd64 (2:1.0.21-2, 2:1.0.22-2), libhttp-message-perl:amd64 (6.14-1, 6.18-1), libnl-route-3-200:amd64 (3.2.29-0ubuntu3, 3.4.0-1), fuse:amd64 (2.9.7-1ubuntu1, 2.9.8-1ubuntu1), libkrb5-3:amd64 (1.16-2build1, 1.16-2ubuntu1), dosfstools:amd64 (4.1-1, 4.1-2), libgssapi-krb5-2:amd64 (1.16-2build1, 1.16-2ubuntu1), python-psutil:amd64 (5.4.2-1, 5.4.6-1build1), libpangoft2-1.0-0:amd64 (1.40.14-1, 1.42.4-1), libwww-robotrules-perl:amd64 (6.01-1, 6.02-1), libnghttp2-14:amd64 (1.30.0-1ubuntu1, 1.32.0-1), liblapack3:amd64 (3.7.1-4ubuntu1, 3.8.0-1), libseccomp2:amd64 (2.3.1-2.1ubuntu4, 2.3.3-3ubuntu1), glib-networking-services:amd64 (2.56.0-1, 2.57.90-1ubuntu1), landscape-common:amd64 (18.01-0ubuntu3.1, 18.01-0ubuntu4), fonts-font-awesome:amd64 (4.7.0~dfsg-3, 5.0.10+really4.7.0~dfsg-1), libaudit-common:amd64 (1:2.8.2-1ubuntu1, 1:2.8.3-1ubuntu2), libcom-err2:amd64 (1.44.1-1, 1.44.4-2), libcups2:amd64 (2.2.7-1ubuntu2, 2.2.8-5ubuntu1), intel-microcode:amd64 (3.20180425.1~ubuntu0.18.04.1, 3.20180807a.1), pollinate:amd64 (4.33-0ubuntu1~18.04.1, 4.33-0ubuntu1), libwind0-heimdal:amd64 (7.5.0+dfsg-1, 7.5.0+dfsg-2), update-manager-core:amd64 (1:18.04.11, 1:18.10.3), networkd-dispatcher:amd64 (1.7-0ubuntu3, 1.7-0ubuntu6), libsemanage1:amd64 (2.7-2build2, 2.8-1build1), uuid-runtime:amd64 (2.31.1-0.4ubuntu3.1, 2.32-0.1ubuntu1), python3-zope.interface:amd64 (4.3.2-1build2, 4.3.2-1build3), python-openssl:amd64 (17.5.0-1ubuntu1, 18.0.0-1), libfdisk1:amd64 (2.31.1-0.4ubuntu3.1, 2.32-0.1ubuntu1), publicsuffix:amd64 (20180223.1310-1, 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liblzo2-2:amd64 (2.08-1.2, 2.10-0.1), busybox-initramfs:amd64 (1:1.27.2-2ubuntu3, 1:1.27.2-2ubuntu4), btrfs-progs:amd64 (4.15.1-1build1, 4.16.1-2ubuntu1), libslang2:amd64 (2.3.1a-3ubuntu1, 2.3.2-1ubuntu1), software-properties-common:amd64 (0.96.24.32.3, 0.96.27), liberror-perl:amd64 (0.17025-1, 0.17026-1), libpng16-16:amd64 (1.6.34-1, 1.6.34-2)
End-Date: 2018-08-28  05:17:54

Start-Date: 2018-08-28  05:22:47
Commandline: apt-get install rsnapshot
Requested-By: mpadmin (1000)
Install: liblchown-perl:amd64 (1.01-3build3, automatic), rsnapshot:amd64 (1.4.2-1)
End-Date: 2018-08-28  05:22:50

I looked at /etc/apt/sources.list and did note there was one reference to Cosmic:

#added for troublshooting initramfs-tools-core 10
deb ubuntu .cs. utah. edu/ ubuntu cosmic main
#deb-src

Could this really have forced an upgrade to 18.10?? Please help, deadline and no clue how to downgrade. I’ll take any wild geese

Hi,

To confirm your running version could you post the contents of your /etc/os-release file?

About the issue: what settings do you have in /etc/libvirt/qemu.conf file regarding the following keys:
user=
group=

For a generic downgrade guide you can visit our How to downgrade Ubuntu Linux system to its previous version

@4everlearning how did you resolve this issue, because currently i am facing the same