root@ip-172-31-16-143:/var/lib/juju/agents/unit-review-queue-0/charm# apt update
Ign http://us-east-1.ec2.archive.ubuntu.com trusty InRelease
Hit http://us-east-1.ec2.archive.ubuntu.com trusty-updates InRelease
Hit http://us-east-1.ec2.archive.ubuntu.com trusty-backports InRelease
Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release.gpg                 
Hit http://us-east-1.ec2.archive.ubuntu.com trusty Release                     Couldn't create tempfiles for splitting up /var/lib/apt/lists/us-east-1.ec2.archive.ubuntu.com_ubuntu_dists_trusty-updates_InRelease
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates InRelease           
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-backports InRelease         Couldn't create tempfiles for splitting up /var/lib/apt/lists/us-east-1.ec2.archive.ubuntu.com_ubuntu_dists_trusty-backports_InRelease
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main Sources/DiffIndex
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/restricted Sources/DiffIndex
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/universe Sources/DiffIndex
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/multiverse Sources/DiffIndex
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/main amd64 Packages/DiffIndex
Ign http://us-east-1.ec2.archive.ubuntu.com trusty-updates/restricted amd64 Packages/DiffIndex
W: GPG error: http://us-east-1.ec2.archive.ubuntu.com trusty-updates InRelease: Could not execute 'gpgv' to verify signature (is gpgv installed?)
W: GPG error: http://us-east-1.ec2.archive.ubuntu.com trusty-backports InRelease: Could not execute 'gpgv' to verify signature (is gpgv installed?)
E: Couldn't create temporary file to work with /var/lib/apt/lists/us-east-1.ec2.archive.ubuntu.com_ubuntu_dists_trusty_Release - mkstemp (2: No such file or directory)