How to fix fatal: Couldn't find remote ref refs/heads/branch-name in Git

# Fetch the latest remote info
git fetch origin

# List all remote branches
git branch -r

# Or list all branches (local and remote)
git branch -a

git reflog show --all | grep "branch-name"

# List remote branches and search for similar names
git branch -r | grep -i "branch"

# Check if using different casing
git branch -r | grep -i "feature"

# Prune deleted remote branches
git fetch --prune

# Or prune specifically from origin
git remote prune origin

# Verify the cleanup
git branch -r

# .github/workflows/ci.yml
on:
  push:
    branches:
      - main  # Update from old branch name
      - develop
  pull_request:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main  # Ensure this branch exists

# .gitlab-ci.yml
default:
  # Remove hardcoded branch references if not needed

deploy:
  script:
    - echo "Deploying..."
  only:
    - main  # Update to existing branch

// Jenkinsfile
pipeline {
    agent any
    stages {
        stage('Checkout') {
            steps {
                git branch: 'main',  // Update branch name
                    url: 'https://github.com/user/repo.git'
            }
        }
    }
}

# Update your local default branch
git branch -m master main
git fetch origin
git branch -u origin/main main
git remote set-head origin -a

# Verify the change
git remote show origin

# Search for 'master' references in config files
grep -r "master" .github/ .gitlab-ci.yml Jenkinsfile 2>/dev/null

# If you have the branch locally
git push origin branch-name

# If you know the last commit hash
git checkout -b branch-name <commit-hash>
git push origin branch-name

# Check submodule status
git submodule status

# View submodule configuration
cat .gitmodules

[submodule "libs/mylib"]
    path = libs/mylib
    url = https://github.com/user/mylib.git
    branch = main  # Update to existing branch

git submodule sync
git submodule update --init --recursive

# Get the default branch name from remote
DEFAULT_BRANCH=$(git remote show origin | grep "HEAD branch" | cut -d ":" -f 2 | xargs)

# Use it in your commands
git checkout "$DEFAULT_BRANCH"
git pull origin "$DEFAULT_BRANCH"

- name: Get default branch
  run: |
    DEFAULT_BRANCH=$(git remote show origin | grep "HEAD branch" | cut -d ":" -f 2 | xargs)
    echo "DEFAULT_BRANCH=$DEFAULT_BRANCH" >> $GITHUB_ENV

- name: Checkout default
  run: git checkout ${{ env.DEFAULT_BRANCH }}