When I restarted my laptop in order to boot on 3.19 kernel so that I can
uninstall the 4.5.0-040500rc7 kernel and install another kernel (like
4.4.5-wily) I got a system freeze: it seemed that it happened right
after the system performed the logout. After starting, here is what I
see in the syslog:

     22 Mar 10 10:44:35 my-ubuntu avahi-daemon[810]: Invalid response packet 
from host fe80::2f7:6fff:fe6e:9126.
     23 Mar 10 11:18:20 my-ubuntu avahi-daemon[810]: Invalid response packet 
from host fe80::d2a6:37ff:fee3:fb44.
     24 Mar 10 11:29:08 my-ubuntu compiz: pam_ecryptfs: seteuid error
     25 Mar 10 11:35:19 my-ubuntu compiz: pam_ecryptfs: seteuid error
     26 Mar 10 11:50:25 my-ubuntu compiz: pam_ecryptfs: seteuid error
     27 Mar 10 12:13:23 my-ubuntu compiz: pam_ecryptfs: seteuid error
     28 
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
     28 
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
     28 
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
     28 
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
     28 
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Mar
 10 12:16:20 my-ubuntu rsyslogd: [origin software="rsyslogd" swVersion="7.4.4" 
     28 x-pid="914" x-info="http://www.rsyslog.com";] start
     29 Mar 10 12:16:20 my-ubuntu rsyslogd: rsyslogd's groupid changed to 104
     30 Mar 10 12:16:20 my-ubuntu rsyslogd: rsyslogd's userid changed to 101
     31 Mar 10 12:16:20 my-ubuntu kernel: [    0.000000] Initializing cgroup 
subsys cpuset

I also wanted to attach the generated /var/crash/_lib_systemd_systemd-
logind.0.crash (because I installed and configured the Kernel Crash Dump
tool yesterday afternoon), but I get from this web site:
ERR_ACCESS_DENIED

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https://bugs.launchpad.net/bugs/1552333

Title:
  After upgrade to 4.2 kernel Ubuntu 14.04 LTS randomly freezes
  completely

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