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sudo apt update 失败

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sudo apt update 失败 
Err:17 http://us.archive.ubuntu.com/ubuntu focal-updates/universe amd64 DEP-11 Metadata
  Hash Sum mismatch
  Hashes of expected file:
   - Filesize:762382 [weak]
   - SHA256:6992cdbbeec75ab9a81f82dfe79b787bbe0da0587ddbb71090e3f5a1d6f14794
   - SHA1:c8ad07aa2316c5db1251db7ba3c8cc83d74deded [weak]
   - MD5Sum:e8523de342151179aac680d249b86bed [weak]
  Hashes of received file:
   - SHA256:ee0640fcd2f7494c1e038f2aa14b91f3e4bcd1a7262052e981b40f5cabf1d22a
   - SHA1:c8ad07aa2316c5db1251db7ba3c8cc83d74deded [weak]
   - MD5Sum:e8523de342151179aac680d249b86bed [weak]
   - Filesize:762382 [weak]
  Last modification reported: Tue, 29 Sep 2020 00:30:01 +0000
  Release file created at: Tue, 29 Sep 2020 01:31:09 +0000
Fetched 218 kB in 3s (83.8 kB/s)   
Reading package lists... Done
E: Failed to fetch store:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_focal-updates_universe_dep11_Components-amd64.yml.xz  Hash Sum mismatch
   Hashes of expected file:
    - Filesize:762382 [weak]
    - SHA256:6992cdbbeec75ab9a81f82dfe79b787bbe0da0587ddbb71090e3f5a1d6f14794
    - SHA1:c8ad07aa2316c5db1251db7ba3c8cc83d74deded [weak]
    - MD5Sum:e8523de342151179aac680d249b86bed [weak]
   Hashes of received file:
    - SHA256:ee0640fcd2f7494c1e038f2aa14b91f3e4bcd1a7262052e981b40f5cabf1d22a
    - SHA1:c8ad07aa2316c5db1251db7ba3c8cc83d74deded [weak]
    - MD5Sum:e8523de342151179aac680d249b86bed [weak]
    - Filesize:762382 [weak]
   Last modification reported: Tue, 29 Sep 2020 00:30:01 +0000
   Release file created at: Tue, 29 Sep 2020 01:31:09 +0000
E: Some index files failed to download. They have been ignored, or old ones used instead.

答案1

尝试：

sudo apt-get clean
sudo apt-get update

如果这不起作用，请尝试这。

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