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Ubuntu phased updates.md

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+# Q: Ubuntu phased updates
+
+Recently, during the normal software upgrade process (i.e., apt upgrade or apt dist-upgrade) I started getting messages like this:
+
+```
+[...]
+The following packages have been kept back:
+[...]
+0 upgraded, 0 newly installed, 0 to remove and [...] not upgraded.
+```
+What are my options?
+
+## A: Phased Updates are a safety feature
+Some users get the upgraded packages first, and have the ability to report broken package, instead of everybody getting a broken package at once and millions of users scratching their heads.
+It's there for your protection. Don't try to outsmart it.
+
+Kept-back packages due to Phased Updates will automatically resolve themselves, download, and install over a week or so.
+Most users should DO NOTHING. It's not broken. Don't try to force upgrades. Just be patient and let the system work.
+
+## Diagnosis -- how to tell if Phased Updates is the culprit:
+
+It's easy. Run apt-cache policy <packagename> on one of your held back packages. Look for the 'phased' percentage. It's only present if the package is currently phasing.
+
+```
+$ apt-cache policy gir1.2-gstreamer-1.0
+gir1.2-gstreamer-1.0:
+  Installed: 1.20.3-0ubuntu1
+  Candidate: 1.20.3-0ubuntu1
+  Version table:
+ *** 1.20.3-0ubuntu1 500 (phased 40%) <----------------- There it is!
+        500 http://archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
+        100 /var/lib/dpkg/status
+     1.20.1-1 500
+        500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
+```
+
+## Reference
+
+* [Reference 1](https://askubuntu.com/a/1421130)
+* [Reference 2](https://discourse.ubuntu.com/t/phased-updates-in-apt-in-21-04/20345)