Fix invalid links reported by linkcheck.

(Introduced the extlinks extension for handling manpage links.)

doc/custom_conf.py

@@ -122,6 +122,7 @@
 # Add extensions
 custom_extensions = [
     'sphinx.ext.intersphinx',
+    'sphinx.ext.extlinks'
 ]
 
 # Add files or directories that should be excluded from processing.
@@ -172,3 +173,7 @@
 # can be copied even if they don't contain an EOF line.
 copybutton_prompt_text = '$ '
 copybutton_only_copy_prompt_lines = False
+
+extlinks = {
+    'manualpage': ( 'https://manpages.ubuntu.com/manpages/lunar/en/%s', '' )
+}

doc/explanation/operate-server-installer.rst

@@ -5,7 +5,7 @@ Operating the Server installer
 
 This document explains how to use the installer in general terms. For a
 step-by-step guide through the screens of the installer, you can use our
-`screen-by-screen reference guide <https://discourse.ubuntu.com/t/draft-using-the-server-installer-step-by-step/16690>`_.
+`screen-by-screen reference guide <https://discourse.ubuntu.com/t/screen-by-screen-installer-guide/16690>`_.
 
 Get the installer
 =================

doc/index.rst

@@ -83,7 +83,7 @@ constructive feedback.
    development/index
 
 .. Links:
-.. _Code of Conduct: https://ubuntu.com/community/code-of-conduct
+.. _Code of Conduct: https://ubuntu.com/community/ethos/code-of-conduct
 .. _Ubuntu Foundations: https://discourse.ubuntu.com/c/foundations/
 .. _Libera.Chat: https://libera.chat/
 .. _CONTRIBUTING.md: https://github.com/canonical/subiquity/blob/main/CONTRIBUTING.md

doc/reference/autoinstall-reference.rst

@@ -144,8 +144,7 @@ installed will not have a keyboard at all in which case the value used here
 does not matter.
 
 The mapping's keys correspond to settings in the :file:`/etc/default/keyboard`
-configuration file. See
-`its manual page <http://manpages.ubuntu.com/manpages/keyboard.5.html>`_
+configuration file. See the :manualpage:`keyboard(5) manual page <man5/keyboard.5.html>`
 for more details.
 
 The mapping contains keys:
@@ -635,10 +634,9 @@ password
 The password for the new user, encrypted. This is required for use with
 ``sudo``, even if SSH access is configured.
 
-The crypted password string must conform to what
-`passwd <https://manpages.ubuntu.com/manpages/passwd.1.html>`_
-expects. Depending on the special characters in the password hash, quoting may
-be required, so it's safest to just always include the quotes around the hash.
+The crypted password string must conform to what the
+``passwd`` command requires. See the :manualpage:`passwd(1) manual page <man1/passwd.1.html>`
+for details. Quote the password hash to ensure correct treatment of any special characters.
 
 Several tools can generate the crypted password, such as ``mkpasswd`` from the
 ``whois`` package, or ``openssl passwd``.

doc/tutorial/basic-server-installation.rst

@@ -65,7 +65,7 @@ Create a bootable USB
 
 There are many ways to boot the installer but the simplest and most common way
 is to
-`create a bootable USB stick <https://ubuntu.com/tutorials/tutorial-create-a-usb-stick-on-ubuntu>`_
+`create a bootable USB stick <https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu>`_
 to boot the system to be installed with
 (`tutorials for other operating systems <https://ubuntu.com/search?q=%22create+a+bootable+USB+stick%22>`_
 are also available). 

doc/tutorial/screen-by-screen.rst

@@ -15,7 +15,7 @@ This screen selects the language for the installer and the default language
 for the installed system.
 
 More languages can be displayed if you
-`connect via SSH <https://discourse.ubuntu.com/t/draft-using-the-server-installer/16689#connect-via-ssh>`_.
+`connect via SSH <https://discourse.ubuntu.com/t/how-to-operate-the-server-installer/16689#connect-via-ssh>`_.
 
 Refresh
 =======