(non-UEFI, Ubuntu 17.04) package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[wxdf]

incomplete installation

ProblemType: Package
DistroRelease: Ubuntu 17.04
Package: shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
Uname: Linux 4.10.0-19-generic x86_64
.proc.sys.kernel.moksbstate_disabled: 0
.sys.firmware.efi.efivars.MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/sys/firmware/efi/efivars/MokSBStateRT-605dab50-e046-4300-abb6-3dd810dd8b23'
.sys.firmware.efi.efivars.SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/sys/firmware/efi/efivars/SecureBoot-8be4df61-93ca-11d2-aa0d-00e098032b8c'
ApportVersion: 2.20.4-0ubuntu4
AptOrdering:
 shim:amd64: Install
 shim-signed:amd64: Install
 NULL: ConfigurePending
Architecture: amd64
BootEFIContents:
 fw
 fwupx64.efi
Date: Fri Apr 14 11:12:53 2017
Df:
 Dateisystem 1K-Blöcke Benutzt Verfügbar Verw% Eingehängt auf
 /dev/sda7 76630796 6402980 66292072 9% /
 /dev/sdc1 64802784 3218816 61583968 5% /cdrom
 udev 1724064 0 1724064 0% /dev
 tmpfs 348112 10396 337716 3% /run
EFIBootMgr: Error: command ['efibootmgr', '-v'] failed with exit code 2: EFI variables are not supported on this system.
ErrorMessage: subprocess installed post-installation script returned error exit status 1
RelatedPackageVersions:
 dpkg 1.18.10ubuntu2
 apt 1.4
SourcePackage: shim-signed
Title: package shim-signed 1.28+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)