apport-bug: add page (#4027)

pages/linux/apport-bug.md

@@ -0,0 +1,20 @@
+# apport-bug
+
+> File a bug report on Ubuntu.
+> More information: <https://wiki.ubuntu.com/Apport>.
+
+- Report a bug about the whole system:
+
+`apport-bug`
+
+- Report a bug about a specific package:
+
+`apport-bug {{package}}`
+
+- Report a bug about a specific executable:
+
+`apport-bug {{path/to/executable}}`
+
+- Report a bug about a specific process:
+
+`apport-bug {{PID}}`