I had same error but with 0.136ubuntu6.6
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https://bugs.launchpad.net/bugs/1898397
Title:
package initramfs-tools 0.136ubuntu6.3 failed to install/upgrade:
installed initramfs-tools
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: initramfs-tools (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1898397
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1898397
Title:
package initramfs-tools 0.136ubuntu6.3 failed to install/upgrade:
installed initramfs-tools