Fix "initramfs unpacking failed: Decoding failed" in Ubuntu Boot
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1. Open the "/etc/initramfs-tools/initramfs.conf" file (with nano, kate, ect.)
2. Change "COMPRESS=lz4" to "COMPRESS=gzip" in that file.
3. Save changes.
4. Reboot.
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From: https://forums.linuxmint.com/viewtopic.php?t=323152
Date Searched: December 8th, 2020 @ 2:06AM