[Bug 1927999] [NEW] 20.04 installer Errno 5

[elatllat]

Public bug reported:

I have a laptop that was running 18.04,
20.04 would not install.
21.04 also failed.
Fedora 34 installed without issue.

Ubuntu GUI said

 The installer encountered an error copying files to the hard disk:
[Errno 5]

dmesg said

    SQUASHFS error: zlib decompression failed, data probably corrupt
    SQUASHFS error: failed to read block 0x2df825be: -5

/var/log/casper.log said

    cannot read /var/lib/dpkg/info/diffutils.list (Input/output error)


the iso sha matches, badblocks and cat found no issues with the source or destination disk.

** Affects: base-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1927999

Title:
  20.04 installer Errno 5

Status in base-installer package in Ubuntu:
  New

Bug description:
  I have a laptop that was running 18.04,
  20.04 would not install.
  21.04 also failed.
  Fedora 34 installed without issue.

  Ubuntu GUI said

   The installer encountered an error copying files to the hard disk:
  [Errno 5]

  dmesg said

      SQUASHFS error: zlib decompression failed, data probably corrupt
      SQUASHFS error: failed to read block 0x2df825be: -5

  /var/log/casper.log said

      cannot read /var/lib/dpkg/info/diffutils.list (Input/output error)

  
  the iso sha matches, badblocks and cat found no issues with the source or destination disk.

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