>From the dpkg log:

problems making Certificate Request
140700872008128:error:0D07A097:asn1 encoding 
routines:ASN1_mbstring_ncopy:string too 
long:../crypto/asn1/a_mbstr.c:109:maxsize=64

from dmesg:

[   19.639051] systemd[1]: Set hostname to <finisdiem-HP-Pavilion-g6
-Notebook-PC>.

This definitely causes the openssl req option, -subj "/CN=`hostname -s`
Secure Boot Module Signature key", to exceed 64 bytes.

We should probably just take the first 31 bytes of the hostname.

** Changed in: shim-signed (Ubuntu)
       Status: New => Triaged

** Changed in: shim-signed (Ubuntu)
   Importance: Undecided => Critical

** Description changed:

+ key generation fails if short hostname length > 31 chars
+ 
  failed on install with apt in terminal. My computer had froze while on
  browser. i had to hard reset, then i did update then upgrade. tried
  upgrade -f
  
  ProblemType: Package
  DistroRelease: Ubuntu 18.04
  Package: shim-signed 1.34.1+13-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  .proc.sys.kernel.moksbstate_disabled: Error: [Errno 2] No such file or 
directory: '/proc/sys/kernel/moksbstate_disabled'
  ApportVersion: 2.20.9-0ubuntu6
  Architecture: amd64
  Date: Fri Apr 20 20:45:53 2018
  ErrorMessage: installed shim-signed package post-installation script 
subprocess returned error exit status 1
  InstallationDate: Installed on 2018-02-10 (70 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 
2.7.15~rc1-1
  RelatedPackageVersions:
-  dpkg 1.19.0.5ubuntu2
-  apt  1.6.1
+  dpkg 1.19.0.5ubuntu2
+  apt  1.6.1
  SecureBoot: 6   0   0   0   0
  SourcePackage: shim-signed
  Title: package shim-signed 1.34.1+13-0ubuntu2 failed to install/upgrade: 
installed shim-signed package post-installation script subprocess returned 
error exit status 1
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1765905

Title:
  package shim-signed 1.34.1+13-0ubuntu2 failed to install/upgrade:
  installed shim-signed package post-installation script subprocess
  returned error exit status 1

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