The problem is curl is not installed, so the NVM installation never happened.
That is why:
nvm: command not found
appears.

Fix Step-by-Step
Step 1 — Install curl
Run:
sudo apt update
Then:
sudo apt install curl
Type your password if asked.

Step 2 — Install NVM Again
Now run:
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.7/install.sh | bash

Step 3 — Reload Bash
Run:
source ~/.bashrc

Step 4 — Check NVM
Run:
nvm --version
If installed correctly, it shows something like:
0.39.7

Step 5 — Install Latest Node.js
Run:
nvm install node

Step 6 — Verify
node -v
You should see:
v20.x.x
or newer.

Step 7 — Create Vite App
Now finally:
npm create vite@latest
This should work correctly now.