Questions[sha256](ubuntu)

When running apt full-upgrade or apt update I'm getting several logs that are more or less the same as this one, where there is an identical filesize, SHA1 and MD5 but different SHA256:

E: Failed to fetch store:/var/lib/apt/lists/partial/jp.archive.ubuntu.com_ubuntu_dists_focal_main_binary-amd64_Packages.xz  Hash Sum mismatch
   Hashes of expected file:
    - Filesize:5826751 [weak]
    - SHA256:af226b4496cbb524bd4814d102047ae77769836203274dffc91cb543d5da13cc
    - SHA1:aef5c36ce45bd5c3154a1bb03c62b6cfb33e2bc6 [weak]
    - MD5Sum:7ef83228ec207df10acac48fbdd81112 [weak]
   Hashes of received file:
    - SHA256:e2c7fc5a2d86f75f03612fec614dcf84d3d502976558fbe40928c1dd120bb05e
    - SHA1:aef5c36ce45bd5c3154a1bb03c62b6cfb33e2bc6 [weak]
    - MD5Sum:7ef83228ec207df10acac48fbdd81112 [weak]
    - Filesize:5826751 [weak]
   Last modification reported: Thu, 23 Apr 2020 16:40:26 +0000
   Release file created at: Thu, 23 Apr 2020 17:33:17 +0000

Whereas others have the same MD5, but different SHA1 and SHA256:

E: Failed to fetch http://jp.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-headers-5.4.0-29_5.4.0-29.33_all.deb  Hash Sum mismatch
   Hashes of expected file:
    - SHA256:edde13dcd52c51e2404d37731948d491e6e215b22f599239326809754f8d5633
    - SHA1:3e46354d6aaa92f82d5392a80f6b72c3fcc78a91 [weak]
    - MD5Sum:4ccf38c666c836f29fc3602314de47b9 [weak]
    - Filesize:10936232 [weak]
   Hashes of received file:
    - SHA256:9af606f85850ba3010ac8743f62dca91bbef3e5e60da5a7df62dac53eb5a4fb7
    - SHA1:61c842d896676ac9af0fef9f9f48bc4a3c39cce6 [weak]
    - MD5Sum:4ccf38c666c836f29fc3602314de47b9 [weak]
    - Filesize:10936232 [weak]
   Last modification reported: Thu, 30 Apr 2020 08:23:38 +0000

This problem is similar to what is asked here, and indeed I tried several of the solutions offered there (and elsewhere) but they did not help. However I am wondering specifically about why the SHA-1 and MD5Sum are identical, and only SHA256 is different. Does this mean that there is a security problem somewhere along the line? Or is my system reading SHA256 incorrectly? Something else?

Thanks

I'm trying to better understand the use of "SHA256SUMS" and "grep." The Ubuntu verify and authenticate tutorial uses the following term: "sha256sum -c SHA256SUMS 2>&1 | grep OK" to verify the download hasn't been corrupted.

I understand it's checking at the SHA256SUMS file that contains two hash values, one for the Desktop version and one for the Live. The usage worked, and I checked it by manually verifying the hash values.

My question is what is the "SHA256SUMS 2>&1" portion doing? Also, it appears to be a part of the "SHA256SUMS" command, though I don't see that usage on the man page I use. Then somehow the result is piped to "grep" to pattern-match with no options.

I'd like to understand it well enough to use the technique in verifying that other software downloads haven't been corrupted.

this is my first post so sorry for any tardiness.

I am trying to install this: Tree of Savior - Steam

Which requires Winetricks in the list of dependencies.

However when downloading the Steam installer .exe I am always getting this error:

> user1@unknown:/tmp$ ./winetricks steam -v
> ------------------------------------------------------
You are using a 64-bit WINEPREFIX. Note that many verbs only install 32-bit versions
> of packages. If you encounter problems, please retest in a clean
> 32-bit WINEPREFIX before reporting a bug.
> ------------------------------------------------------
Using winetricks 20180513-next - sha256sum:
> e4b2f5e8703247ea422b9094293a754339fd63c890a82b777fb9dbb6b6b369b0 with
> wine-3.9 and WINEARCH=win64 Executing w_do_call steam Executing
> load_steam  Executing cd /home/user1/.cache/winetricks/steam
> Downloading
> http://media.steampowered.com/client/installer/SteamSetup.exe to
> /home/user1/.cache/winetricks/steam
> --2018-05-30 14:59:00--  http://media.steampowered.com/client/installer/SteamSetup.exe
> Resolving media.steampowered.com (media.steampowered.com)...
> 193.229.109.27, 193.229.109.25 Connecting to media.steampowered.com (media.steampowered.com)|193.229.109.27|:80... connected. HTTP request
> sent, awaiting response... 200 OK Length: 1573568 (1,5M)
> [application/octet-stream] Saving to: ‘SteamSetup.exe’
> 
> SteamSetup.exe      100%[===================>]   1,50M  1,42MB/s    in
> 1,1s    
> 
> 2018-05-30 14:59:01 (1,42 MB/s) - ‘SteamSetup.exe’ saved
> [1573568/1573568]
> 
> Executing cd /tmp
> ------------------------------------------------------
sha256sum mismatch! Rename /home/user1/.cache/winetricks/steam/SteamSetup.exe
> and try again.
> ------------------------------------------------------

I have tried the solutions here: winetricks sha1sum mismatch rename and try again

Here: Installing Winetricks on Ubuntu LTS 18.04 for Steam

Here: https://forum.winehq.org/viewtopic.php?p=47908

and in many other places. I have also tried re-downloading, re-naming et cetera. I cannot seem to find a way to successfully download and install this file.

Does anyone have any other ideas?

I am unable to generate the hash for the netbeans 8.2 for Ubuntu 16.04 after I write the command:

ravi@Dell:~/Downloads$ sha256 netbeans-8.2-linux.sh 
mlockall: Cannot allocate memory
Warning: couldn't lock memory, are you root?
Enter passphrase: 

Now what is this passphrase?
What should I do now?

How can I find the SHA256 hash of a webpage using Linux tools (CURL, etc.)?