Probably just a transmission glitch. Clear out the apt cache and try again.
sudo apt-get clean
sudo apt-get update

Let us know if it works.

** Package changed: ubuntu => apt (Ubuntu)

** Changed in: apt (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1907510

Title:
  Apt-get upgrade fails with checksum errors

Status in apt package in Ubuntu:
  Incomplete

Bug description:
  scw@ellen:~$ lsb_release -rd
  Description:    Ubuntu 20.04.1 LTS
  Release:        20.04
  ?
  I expected a number of packages to be upgraded
  What I got was this:




  Err:3 http://us.archive.ubuntu.com/ubuntu focal-updates/main amd64 
linux-firmware all 1.187.6
    Hash Sum mismatch
    Hashes of expected file:
     - 
SHA512:b198b64b10643e8515f870c1e8e3edcfec446d1ff82780d50d04b859e14a3448f22ffe1d42a25c73fe8e746e4a764032798d02fdf3287cd8eb378f903d358a59
     - SHA256:9e128cf120150f7165b94edd1ac0e0ab32aa799b427523d98abcfe68030b6e12
     - SHA1:366eb2906eceb6acf17f4db1e6b02f8b4542f2e4 [weak]
     - MD5Sum:d6b26be80cf8a51822628cd412202b81 [weak]
     - Filesize:99497284 [weak]
    Hashes of received file:
     - 
SHA512:6c842fe3eaaa4148939a8dc59472e4229f221b500ea5c7d506d62b218c3d42b9f352f3ae7dc75fc7c9b9bae743abcfce45e5145cf9a05b976c32fb94e713deba
     - SHA256:429e462403f7680d8377d845ab0d1be8b625339d24a440d226d0622af9a56d98
     - SHA1:d506c2bf77b76b5b3e8c008b649a066353dc999f [weak]
     - MD5Sum:1f56350abd87c4bc6bb3291f0412cded [weak]
     - Filesize:99497284 [weak]
    Last modification reported: Thu, 26 Nov 2020 17:18:59 +0000
  Fetched 99.7 MB in 14s (6,967 kB/s)
  E: Failed to fetch 
http://us.archive.ubuntu.com/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.187.6_all.deb
  Hash Sum mismatch
     Hashes of expected file:
      - 
SHA512:b198b64b10643e8515f870c1e8e3edcfec446d1ff82780d50d04b859e14a3448f22ffe1d42a25c73fe8e746e4a764032798d02fdf3287cd8eb378f903d358a59
      - SHA256:9e128cf120150f7165b94edd1ac0e0ab32aa799b427523d98abcfe68030b6e12
      - SHA1:366eb2906eceb6acf17f4db1e6b02f8b4542f2e4 [weak]
      - MD5Sum:d6b26be80cf8a51822628cd412202b81 [weak]
      - Filesize:99497284 [weak]
     Hashes of received file:
      - 
SHA512:6c842fe3eaaa4148939a8dc59472e4229f221b500ea5c7d506d62b218c3d42b9f352f3ae7dc75fc7c9b9bae743abcfce45e5145cf9a05b976c32fb94e713deba
      - SHA256:429e462403f7680d8377d845ab0d1be8b625339d24a440d226d0622af9a56d98
      - SHA1:d506c2bf77b76b5b3e8c008b649a066353dc999f [weak]
      - MD5Sum:1f56350abd87c4bc6bb3291f0412cded [weak]
      - Filesize:99497284 [weak]
     Last modification reported: Thu, 26 Nov 2020 17:18:59 +0000

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