unexpected return value from verify_checksum: -5

[Addict]

Greetings.

I'm a very new ubuntu user and im trying to download a basic-scheme texlive install however I've run into problems when trying to use tlmgr to download packages I get the message "/usr/bin/tlmgr:unexpected return value from verify_checksum: -5"
After a bit of searching online i found this post
https://tex.stackexchange.com/questions/528634/tlmgr-unexpected-return-value-from-verify-checksum-5
however even after adding the lines

export PATH=$PATH:/usr/local/texlive/2021/bin/x86_64-linux export MANPATH=/usr/local/texlive/2021/texmf-dist/doc/man export INFOPATH=/usr/local/texlive/2021/texmf-dist/doc/info

to .bashrc accessed by:

$ cd
$ vim .bashrc

when using

$ echo $PATH

It returns

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/texlive/2021/bin/x86_64-linux:/usr/local/texlive/2021/bin/x86_64-linux

which im guessing means that it has been added to PATH as instructed by the post?

however running

$ sudo env PATH="$PATH" ./update-tlmgr-latest.sh
returns
"Verifying archive integrity...Error in MD5 checksums: 658d7ba1e8ac697d6df7dbd5f6bb58ad is different from 37070fa51acca146e95ff2e2fff2fa77"

and

$ sudo kpsewhich --var-value=SELFAUTOPARENT

still returns just a /

and if I try to install a package with

$ tlmgr install siunitx

it still returns
Im pretty much out of ideas for what to try at this point. If anyone can tell me what I am doing from it would be much appreciated

Best regards

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