Just some extra info, this is occurring for me while using a live usb
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https://bugs.launchpad.net/bugs/1245599
Title:
package initramfs-tools 0.103ubuntu1 failed to install/upgrade:
This is because you've run out of free space on your system. This is an
issue you will need to resolve manually.
** Changed in: initramfs-tools (Ubuntu)
Status: New = Invalid
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** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1245599
Title:
package initramfs-tools 0.103ubuntu1 failed to install/upgrade:
subprocess installed