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
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https://bugs.launchpad.net/bugs/879284
Title:
package bcmwl-kernel-source 5.60.48.36 bdcom-0ubuntu3 failed to
install/upgrade: subprocess installed post-installation script