Patch of add repository command in example-ubuntu.rst

[u-damien]

Added -e option at echo to enable special character to be interpreted like \n or it will raise this error due to a bad interpretation of apt in the collaboraonline.sources file:

E: Type 'deb\nURIs:' is not known on stanza 1 in source list /etc/apt/sources.list.d/collaboraonline.sources
E: The list of sources could not be read.

☑️ Resolves

• Fix #…

🖼️ Screenshots

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/documentation/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[juliusknorr]

/backport to stable31

[juliusknorr]

/backport to stable30

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/13214/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 9adf177e

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/13214/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[backportbot]

The backport to stable30 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable30
git pull origin stable30

# Create the new backport branch
git checkout -b backport/13214/stable30

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 9adf177e

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/13214/stable30

Error: Failed to check for changes with origin/stable30: No changes found in backport branch

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[github-actions]

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