[Bug 1784474] [NEW] canonical-livepatch failing to enable

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I'm trying to enable canonical-livepatch but I keep getting an error
about the freezer cgroup. See below:

$ uname -a
Linux laptop-ubuntu 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 18.04.1 LTS
Release:        18.04
Codename:       bionic

$ sudo snap remove canonical-livepatch
canonical-livepatch removed

$ sudo snap install canonical-livepatch
canonical-livepatch 8.0.2 from 'canonical' installed

$ sudo canonical-livepatch enable REDACTED
cannot open freezer cgroup (/sys/fs/cgroup/freezer): No such file or directory

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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canonical-livepatch failing to enable
https://bugs.launchpad.net/bugs/1784474
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