Been testing further. Based on errors relating to apparmor tried
complain mode for libvirtd followed by reboot and completely disabling
apparmor. However no difference and these messages are still in the
logs.

Seeing this error in the log:

Unable to open /dev/kvm: Permission denied
CODE_FILE       ../../../src/util/virhostcpu.c
CODE_FUNC       virHostCPUGetTscInfo
CODE_LINE       1338
LIBVIRT_CODE    38
LIBVIRT_DOMAIN  0
LIBVIRT_SOURCE  util.error
PRIORITY        3
SYSLOG_FACILITY 24
_AUDIT_LOGINUID 1000
_AUDIT_SESSION  2
_BOOT_ID        8298d387029b4a00ab2c4ff8889ee65e
_CAP_EFFECTIVE  0
_CMDLINE        /usr/sbin/libvirtd --timeout=120
_COMM   libvirtd
_EXE    /usr/sbin/libvirtd
_GID    1000
_HOSTNAME       pdukvm02
_MACHINE_ID     b8db10128faf4d6bb85f42a6bf07a3b8
_PID    1337
_SELINUX_CONTEXT        unconfined
_SOURCE_REALTIME_TIMESTAMP      1597131226041764
_SYSTEMD_CGROUP /user.slice/user-1000.slice/user@1000.service/dbus.service
_SYSTEMD_INVOCATION_ID  8bd95fa9bc554d5587ed2f307645b7f0
_SYSTEMD_OWNER_UID      1000
_SYSTEMD_SLICE  user-1000.slice
_SYSTEMD_UNIT   user@1000.service
_SYSTEMD_USER_SLICE     -.slice
_SYSTEMD_USER_UNIT      dbus.service
_TRANSPORT      journal
_UID    1000
__CURSOR        
s=7a07741964f14008b73e6164241c5bad;i=3c21;b=8298d387029b4a00ab2c4ff8889ee65e;m=17975743;t=5ac9517634db1;x=72d57812f6b29d92
__MONOTONIC_TIMESTAMP   395794243
__REALTIME_TIMESTAMP    1597131226041777

Preceded by:

Failed to read AppArmor profiles list '/sys/kernel/security/apparmor/profiles': 
Permission denied
CODE_FILE       ../../../src/security/security_apparmor.c
CODE_FUNC       profile_status
CODE_LINE       87
LIBVIRT_CODE    38
LIBVIRT_DOMAIN  24
LIBVIRT_SOURCE  util.error
PRIORITY        3
SYSLOG_FACILITY 24
_AUDIT_LOGINUID 1000
_AUDIT_SESSION  2
_BOOT_ID        8298d387029b4a00ab2c4ff8889ee65e
_CAP_EFFECTIVE  0
_CMDLINE        /usr/sbin/libvirtd --timeout=120
_COMM   libvirtd
_EXE    /usr/sbin/libvirtd
_GID    1000
_HOSTNAME       pdukvm02
_MACHINE_ID     b8db10128faf4d6bb85f42a6bf07a3b8
_PID    1337
_SELINUX_CONTEXT        unconfined
_SOURCE_REALTIME_TIMESTAMP      1597131226002371
_SYSTEMD_CGROUP /user.slice/user-1000.slice/user@1000.service/dbus.service
_SYSTEMD_INVOCATION_ID  8bd95fa9bc554d5587ed2f307645b7f0
_SYSTEMD_OWNER_UID      1000
_SYSTEMD_SLICE  user-1000.slice
_SYSTEMD_UNIT   user@1000.service
_SYSTEMD_USER_SLICE     -.slice
_SYSTEMD_USER_UNIT      dbus.service
_TRANSPORT      journal
_UID    1000
__CURSOR        
s=7a07741964f14008b73e6164241c5bad;i=3c20;b=8298d387029b4a00ab2c4ff8889ee65e;m=1796c0aa;t=5ac951762b718;x=9fc636c6f52c48c2
__MONOTONIC_TIMESTAMP   395755690
__REALTIME_TIMESTAMP    1597131226003224

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https://bugs.launchpad.net/bugs/1891092

Title:
  Fresh install of cockpit on 20.04 after patching can no longer manage
  virtual machines

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