Yup. John was right. The date on your Chromebook is Sun Aug 16 11:22:22 CEST 2161
Looking to your log, I found the first problem (I read thread after I found auditd log portion and decipher the time):
[ 2.489343] audit: type=1400 audit(6047083342.480:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/sbin/dhclient" pid=489 comm="apparmor_parser"
[ 2.489350] audit: type=1400 audit(6047083342.480:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=489 comm="apparmor_parser"
[ 2.489355] audit: type=1400 audit(6047083342.480:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=489 comm="apparmor_parser"
[ 2.489358] audit: type=1400 audit(6047083342.480:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=489 comm="apparmor_parser"
[ 2.492907] audit: type=1400 audit(6047083342.484:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session" pid=488 comm="apparmor_parser"
[ 2.492914] audit: type=1400 audit(6047083342.484:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/lightdm/lightdm-guest-session//chromium" pid=488 comm="apparmor_parser"
[ 2.493976] audit: type=1400 audit(6047083342.484:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine" pid=501 comm="apparmor_parser"
[ 2.493985] audit: type=1400 audit(6047083342.484:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine//mount-namespace-capture-helper" pid=501 comm="apparmor_parser"
[ 2.497248] audit: type=1400 audit(6047083342.488:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cups-browsed" pid=503 comm="apparmor_parser"
Just do the CLI command: date -d @6047083342.488 and you'll see.
There are other problems (as well) in your dmesg log. But not to spoil the situation (KUDOS to John). If you find anything else wrong, just scream! ;-)
Zoran