Update cheatsheets

linux/pro

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pro
+
+> Manage Ubuntu Pro services.
+> More information: <https://manpages.ubuntu.com/manpages/latest/man1/ubuntu-advantage.1.html>.
+
+- Connect your system to the Ubuntu Pro support contract:
+
+`sudo pro attach`
+
+- Display the status of Ubuntu Pro services:
+
+`pro status`
+
+- Check if the system is affected by a specific vulnerability (and apply a fix if possible):
+
+`pro fix {{CVE-number}}`
+
+- Display the number of unsupported packages:
+
+`pro security-status`
+
+- List packages that are no longer available for download:
+
+`pro security-status --unavailable`
+
+- List third-party packages:
+
+`pro security-status --thirdparty`