Split machine-specific notes

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diff --git a/guides/sysadmin/machines/little-buster/install.org b/guides/sysadmin/machines/little-buster/install.org
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+* installer
+Touchpad is not recognized, for some reason.
+* first boot
+#+BEGIN_QUOTE
+A start job is running for Load AppArmor profiles
+#+END_QUOTE
+Disappeared after ≈30s 🤷
+
+Wooh touchpad works!  Although the sensitivity is a bit low.
+*NB: solved below.*
+
+Wifi LED is on, whatever that means.
+
+Brightness function keys do not work on the login screen.
+
+Using default XFCE config to get four workspaces.
+
+Brightness and sound function keys work! 🙌
+
+Touchpad click and scroll do not work.
+*NB: solved below.*
+
+Wifi function key does not work.
+
+Battery life seems somewhat shorter than with Bunsenlabs, even after
+applying all powertop tricks in the book.
+* apt install (1/n)
+git greybird-gtk-theme elementary-xfce-icon-theme emacs
+
+git suggests git-doc: why of course, good idea!
+
+emacs suggests emacs-common-non-dfsg: right, what was that again?
+Documentation, IIRC?  What does APT have to say?
+
+#+BEGIN_EXAMPLE
+$ apt show emacs-common-non-dfsg
+Package: emacs-common-non-dfsg
+State: not a real package (virtual)
+N: Can't select candidate version from package emacs-common-non-dfsg as it has no candidate
+N: Can't select versions from package 'emacs-common-non-dfsg' as it is purely virtual
+N: No packages found
+#+END_EXAMPLE
+
+… What does https://packages.debian.org/emacs-common-non-dfsg say?
+
+#+BEGIN_QUOTE
+*[non-free]*
+#+END_QUOTE
+
+[[https://www.debian.org/vote/2006/vote_001][Oh.]]  Well then,
+
+#+begin_src sh
+$ sudo sed -ri 's/^([^#].+ main)$/\1 contrib non-free/' /etc/apt/sources.list
+$ # While in there…
+$ sudo sed -ri 's/^(deb|deb-src) http:/\1 https:/' /etc/apt/sources.list
+#+end_src
+
+What now?
+
+#+BEGIN_EXAMPLE
+$ sudo apt update
+[…]
+Err:4 https://security.debian.org/debian-security buster/updates Release
+  Certificate verification failed: The certificate is NOT trusted. The certificate issuer is unknown. The name in the certificate does not match the expected.  Could not handshake: Error in the certificate verification. [IP: 217.196.149.233 443]
+[…]
+E: The repository 'https://security.debian.org/debian-security buster/updates Release' no longer has a Release file.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
+N: See apt-secure(8) manpage for repository creation and user configuration details.
+#+END_EXAMPLE
+
+🤨
+
+#+begin_src sh
+$ sudo sed -ri 's/security\.debian\.org/deb.debian.org/' /etc/apt/sources.list
+#+end_src
+
+[[https://wiki.debian.org/SourcesList#Example_sources.list][🤷]]
+
+* tweak dotfiles
+Set EMAIL in .profile; copy .profile to .xsessionrc (AFAICT XFCE does
+not read ~/.config/environment.d) to get PATHs.
+
+In .bashrc, enable globstar and autocd, uncomment grep and ls aliases,
+source personal .bash_prompt.
+
+Fun fact!  git can guess user.email from $EMAIL and user.name from the
+[[https://en.wikipedia.org/wiki/Gecos_field][GECOS field]].
+* apt install (2/n)
+#+BEGIN_QUOTE
+E: Package 'gcc-doc' has no installation candidate
+#+END_QUOTE
+gcc-doc is only available in /backports/?
+* configure XFCE
+** Mouse and Touchpad
+- Move sliders a bit to no avail, restore defaults.
+- Google around.
+- Why do my XFCE settings not have this "Touchpad" tab?
+- apt install xserver-xorg-input-synaptics
+- Log out and in again.
+- Woah the pointer is much faster now.
+- And the "Touchpad" tab is here now!
+🎉
+** Panels
+Remove bottom panel: I'd rather remember a few Super-… shortcuts to
+launch these applications rather than waste all this vertical space.
+** Appearance
+*** Style
+Greybird
+
+Patch the xfwm-tabwin style to prevent the mouse from screwing with
+Alt-Tab:
+
+#+begin_src diff
+diff -u /usr/share/themes/Greybird/gtk-2.0/gtkrc.bkp /usr/share/themes/Greybird/gtk-2.0/gtkrc
+--- /usr/share/themes/Greybird/gtk-2.0/gtkrc.bkp
++++ /usr/share/themes/Greybird/gtk-2.0/gtkrc
+@@ -897,8 +897,8 @@
+ 
+ 	bg[NORMAL]	= shade (0.15, @text_color)
+ 	bg[ACTIVE]	= shade (0.65, @selected_bg_color)
+-	bg[PRELIGHT]	= shade (0.75, @selected_bg_color)
+-	bg[SELECTED]	= shade (0.55, @bg_color)
++	bg[PRELIGHT]	= shade (0.55, @bg_color)
++	bg[SELECTED]	= shade (0.75, @selected_bg_color)
+ 
+ 	fg[NORMAL]	= shade (0.8, @base_color)
+ 	fg[ACTIVE]	= @base_color
+#+end_src
+* configure more stuff
+** lightdm
+Debian [[https://wiki.debian.org/LightDM#Enable_user_list][hides the list of users]] on the login screen; Bunsenlabs [[https://github.com/BunsenLabs/bunsen-configs/blob/9.6-1/lightdm.conf.d/50_bunsen.conf][enables
+it]] and I kind of like it (fewer keystrokes, and a cute avatar).