Toolchain with name 'testnet ....... 'does not exist

hey
when i want to set default testnet after updating fuel
i face this error
Toolchain with name ‘testnet-x86_64-unknown-linux-gnu’ does not exist
and there is no test lib installed
when i use fuelup show .
how can i install this testnet module
tried all of these cmds:
fuelup toolchain install latest
fuelup self update
fuelup update
fuelup default latest
fuelup default testnet

root@node2:~# fuelup show
Default host: x86_64-unknown-linux-gnu
fuelup home: /root/.fuelup

installed toolchains
--------------------
latest-x86_64-unknown-linux-gnu (default)

active toolchain
----------------
latest-x86_64-unknown-linux-gnu (default)
  forc : 0.60.0
    - forc-client
      - forc-deploy : 0.60.0
      - forc-run : 0.60.0
    - forc-crypto : 0.60.0
    - forc-debug : 0.60.0
    - forc-doc : 0.60.0
    - forc-explore : 0.28.1
    - forc-fmt : 0.60.0
    - forc-lsp : 0.60.0
    - forc-tx : 0.60.0
    - forc-wallet : 0.7.1
  fuel-core : 0.26.0
  fuel-core-keygen : 0.26.0

fuels versions
--------------
forc : 0.62.0
forc-wallet : 0.62.0
root@node2:~# fuelup default testnet
Toolchain with name 'testnet-x86_64-unknown-linux-gnu' does not exist

Hey @dimi, firstly welcome to the community.
Its strange that its happening to you. Looking at the steps you mentioned, it shouldnt be the case. Though can you follow the installation steps mentioned in the below guide thoroughly and let me know how it goes? Installation | Fuel Docs

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