Update cheatsheets

linux/extrepo

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# extrepo
+
+> Manage external Debian repositories.
+> It is used to manage external repositories in Debian.
+> More information: <https://manned.org/extrepo.1p>.
+
+- Search for a given package:
+
+`extrepo search {{package}}`
+
+- Enable the repository:
+
+`sudo extrepo enable {{repository_name}}`
+
+- Disable the repository:
+
+`sudo extrepo disable {{repository_name}}`
+
+- Update the repository:
+
+`sudo extrepo update {{repository_name}}`