title: E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
body: <p>I want to install firefox in linuxmint</p>
  <p>I run this command:</p>
  <pre><code>sudo apt install firefox
  </code></pre>
  <p>It shows error:</p>
  <p>Reading package lists... Done
  Building dependency tree<br />
  Reading state information... Done
  The following packages were automatically installed and are no longer required:
  linux-headers-5.4.0-65 linux-headers-5.4.0-65-generic linux-image-5.4.0-65-generic linux-modules-5.4.0-65-generic linux-modules-extra-5.4.0-65-generic
  Use 'sudo apt autoremove' to remove them.
  The following additional packages will be installed:
  xul-ext-ubufox
  Suggested packages:
  fonts-lyx
  The following NEW packages will be installed:
  firefox xul-ext-ubufox
  0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
  Need to get 56.5 MB/56.5 MB of archives.
  After this operation, 223 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y
  Get:1 <a href="https://mintmirror.netfirst.in" rel="nofollow noreferrer">https://mintmirror.netfirst.in</a> ulyssa/upstream amd64 firefox amd64 86.0.1+linuxmint1+ulyssa [56.5 MB]
  Err:1 <a href="https://mintmirror.netfirst.in" rel="nofollow noreferrer">https://mintmirror.netfirst.in</a> ulyssa/upstream amd64 firefox amd64 86.0.1+linuxmint1+ulyssa<br />
  Hash Sum mismatch
  Hashes of expected file:</p>
  <ul>
  <li>SHA256:3dea5921498fda8bcf3ce9b661d597aeab1e38f164825414d38b3ff486cf6ab8</li>
  <li>SHA1:f0456c06b42f5ce025d33ca92cc50637922bba7c [weak]</li>
  <li>MD5Sum:b32026167d2427b9a5e6b8915f46d10f [weak]</li>
  <li>Filesize:56464752 [weak]
  Hashes of received file:</li>
  <li>SHA256:76b4d52415582d9491423724487a3846b3def8e561ed522122e78c1f2db0812f</li>
  <li>SHA1:396fef8f0c5a5139f0f417098c51bd63951c17a2 [weak]</li>
  <li>MD5Sum:f84d1dc6e70e0251b33848e7bb0565bc [weak]</li>
  <li>Filesize:56464752 [weak]
  Last modification reported: Mon, 15 Mar 2021 13:31:04 +0000
  Fetched 56.5 MB in 9s (6,636 kB/s)<br />
  E: Failed to fetch <a href="https://mintmirror.netfirst.in/pool/upstream/f/firefox/firefox_86.0.1+linuxmint1+ulyssa_amd64.deb" rel="nofollow noreferrer">https://mintmirror.netfirst.in/pool/upstream/f/firefox/firefox_86.0.1+linuxmint1+ulyssa_amd64.deb</a>  Hash Sum mismatch
  Hashes of expected file:
  - SHA256:3dea5921498fda8bcf3ce9b661d597aeab1e38f164825414d38b3ff486cf6ab8
  - SHA1:f0456c06b42f5ce025d33ca92cc50637922bba7c [weak]
  - MD5Sum:b32026167d2427b9a5e6b8915f46d10f [weak]
  - Filesize:56464752 [weak]
  Hashes of received file:
  - SHA256:76b4d52415582d9491423724487a3846b3def8e561ed522122e78c1f2db0812f
  - SHA1:396fef8f0c5a5139f0f417098c51bd63951c17a2 [weak]
  - MD5Sum:f84d1dc6e70e0251b33848e7bb0565bc [weak]
  - Filesize:56464752 [weak]
  Last modification reported: Mon, 15 Mar 2021 13:31:04 +0000
  E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?</li>
  </ul>
  <p>Anything helpful information would be appreciable.
  Thanks in advance.</p>