Comment 0 for bug 1575616

⟫ adapt install -r trusty -p pgtune
error: Get https://images.linuxcontainers.org:8443/1.0/images/ubuntu/trusty/amd64/default: x509: certificate signed by unknown authority

Output from bash -x http://paste.ubuntu.com/16077534/

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: adapt 1.5-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Apr 27 12:30:57 2016
InstallationDate: Installed on 2015-07-04 (298 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: adapt
UpgradeStatus: Upgraded to xenial on 2016-03-06 (52 days ago)