Install Open Tofu in Proxmox

wget --secure-protocol=TLSv1_2 --https-only https://get.opentofu.org/install-opentofu.sh -O install-opentofu.sh

# Give it execution permissions:
chmod +x install-opentofu.sh

# Please inspect the downloaded script

# Run the installer:
./install-opentofu.sh --install-method deb

sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gnupg

sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://get.opentofu.org/opentofu.gpg | sudo tee /etc/apt/keyrings/opentofu.gpg >/dev/null
curl -fsSL https://packages.opentofu.org/opentofu/tofu/gpgkey | sudo gpg --no-tty --batch --dearmor -o /etc/apt/keyrings/opentofu-repo.gpg >/dev/null
sudo chmod a+r /etc/apt/keyrings/opentofu.gpg /etc/apt/keyrings/opentofu-repo.gpg

echo \
  "deb [signed-by=/etc/apt/keyrings/opentofu.gpg,/etc/apt/keyrings/opentofu-repo.gpg] https://packages.opentofu.org/opentofu/tofu/any/ any main
deb-src [signed-by=/etc/apt/keyrings/opentofu.gpg,/etc/apt/keyrings/opentofu-repo.gpg] https://packages.opentofu.org/opentofu/tofu/any/ any main" | \
  sudo tee /etc/apt/sources.list.d/opentofu.list > /dev/null
sudo chmod a+r /etc/apt/sources.list.d/opentofu.list

sudo apt-get update
sudo apt-get install -y tofu

wget https://go.dev/dl/go1.20.linux-amd64.tar.gz

$ sudo tar -C /usr/local -xzf go1.16.3.linux-amd64.tar.gz

nano ~/.bashrc

# add to file:
export PATH=$PATH:/usr/local/go/bin

$ go version