I tried change to gzip but still same bug, how I fix it? it will affect my system performance?
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Just googling for "initramfs" and "decoding failed", I think you're talking about this upstream bug:
bugs.launchpad.net/ubuntu/+source/linux/+bug/1835660

Not anything I can do about it, you'll need to read through the posts to look for a workaround.
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