Thank you for taking the time to report this bug and helping to make Ubuntu better. The version of update-initramfs that you likely have installed is unable to work on a persistent usb stick. You can resolve this issue by upgrading the version of casper on your system. This can be done via the commands:
sudo apt-get update; sudo apt-get install casper Then performing the software update or installation that you were originally trying. If this does not resolve your bug please set its status back to New. Thanks in advance! ** Tags added: needs-new-casper ** Changed in: initramfs-tools (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/1802719 Title: package initramfs-tools 0.131ubuntu15 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1 Status in initramfs-tools package in Ubuntu: Invalid Bug description: I an installing Ubuntu Studio 18.10 ProblemType: Package DistroRelease: Ubuntu 18.10 Package: initramfs-tools 0.131ubuntu15 ProcVersionSignature: Ubuntu 4.18.0-10.11-lowlatency 4.18.12 Uname: Linux 4.18.0-10-lowlatency x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 CasperVersion: 1.399 Date: Sun Nov 11 10:50:03 2018 ErrorMessage: installed initramfs-tools package post-installation script subprocess returned error exit status 1 LiveMediaBuild: It PackageArchitecture: all Python3Details: /usr/bin/python3.6, Python 3.6.7rc1, python3-minimal, 3.6.6-1 PythonDetails: /usr/bin/python2.7, Python 2.7.15+, python-minimal, 2.7.15-3 RelatedPackageVersions: dpkg 1.19.0.5ubuntu5 apt 1.7.0 SourcePackage: initramfs-tools Title: package initramfs-tools 0.131ubuntu15 failed to install/upgrade: installed initramfs-tools package post-installation script subprocess returned error exit status 1 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1802719/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp