Introduction

When I apt-get update with Kali 2020.2 on Virtual Box, I got addicted to Hash Sum mismatch. I tried the following three methods as a solution, but I got a hash error in the same way and could not solve it, but when I tried it with a certain method, I could solve it, so as a memorandum I will leave it.

The following methods did not work.

Solution ①

$ sudo apt-get update --fix-missing

Solution ②

$ sudo apt-get clean or sudo rm-rf /var/lib/apt/lists/*
$ sudo apt-get update

Solution ③

Edit the config file in /etc/apt/sources.list to get the repository URL http://mirrors.ocf.berkeley.edu/kali kali-rolling main non-free contrib After changing to ʻapt-get update`

solution

So what was the final cause? The hint was that the Hash values match only MD5Sum.

$ sudo apt-get update
Get:1 http://linux3.yz.yamagata-u.ac.jp/pub/linux/kali kali-rolling InRelease [30.5 kB]
Get:2 http://linux3.yz.yamagata-u.ac.jp/pub/linux/kali kali-rolling/main amd64 Packages [16.6 MB]
Err:2 http://linux3.yz.yamagata-u.ac.jp/pub/linux/kali kali-rolling/main amd64 Packages                     
  Hash Sum mismatch
  Hashes of expected file:
   - Filesize:16590427 [weak]
   - SHA256:00ccf318db598c4ddcd7094d28442cdb30088ab7de8cff6c0294de484a102146
   - SHA1:12776612134b22e45ffd84538bcc493c87e881a4 [weak]
   - MD5Sum:b9db76fb5ce9653b1d721068963a1787 [weak]
  Hashes of received file:
   - SHA256:4d733b1f1ead1ce850dbd4ff906a1eb959380b181afb6eba0b9898652f58a2a1
   - SHA1:b14761cbb2748365e608bbd57db3f1c41be04a53 [weak]
   - MD5Sum:b9db76fb5ce9653b1d721068963a1787 [weak]
   - Filesize:16590427 [weak]
  Last modification reported: Tue, 23 Jun 2020 12:03:38 +0000
  Release file created at: Tue, 23 Jun 2020 12:04:33 +0000

Apparently the hash values for SHA256 and SHA1 are different due to the gcrypto20 used in the new Linux. Based on the site listed for reference, I was able to solve it by the following procedure. (Thank you from the bottom of my heart ...!)

$ sudo bash
# mkdir /etc/gcrypt
# echo all >> /etc/gcrypt/hwf.deny

After making this setting

$ sudo apt-get update

I went! !!

reference

https://github.com/ktkr3d/ktkr3d.github.io/issues/1
apt - “Hash sum mismatch” error due to identical SHA1 and MD5 but different SHA256