bug#38447: Instructions to reproduce the issue

[Brice Waegeneire <brice@waegenei.re>]

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I had the same issue on a Hystou P04 and managed to reproduce it several 
times.
Attached to this email is the dump of the installer.

Start the installation process but try to make it fail,
for example by removing the EFI partition during the guided partition,
and when the "Installation failed" menu appear choose "Retrysystem 
install",
on the right. Then restart the installation process with the
same choices and the installer will crash after selecting the keyboard 
layout
variant.

Some time, if you wait for a few minutes before retrying the 
installation, the
crash won't be triggered but then the disk you partitioned during the 
first
installation process won't be available anymore in the disk selection 
menu.

The choices I entered in the installation wizard was:
1. English
2. United States
3. Graphical install
4. Europe
5. Paris
6. English (US)
7. English (intl., with AltGr dead keys)

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In ice-9/eval.scm:
    619:8 19 (_ #(#(#<directory (guile-user) 1558140> #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> final-…>) #))
In ice-9/boot-9.scm:
    829:9 18 (catch #t #<procedure 2ee4920 at ice-9/eval.scm:330:13 ()> #<procedure 2ee4880 at ice-9/boot-9.scm:1048:2 _> _)
In ice-9/eval.scm:
    619:8 17 (_ #(#(#(#<directory (guile-user) 1558140> #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> fi…> …)) …))
   626:19 16 (_ #(#(#(#<directory (guile-user) 1558140> #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> fi…> …)) …))
In ./gnu/installer/steps.scm:
    189:6 15 (run-installer-steps #:steps _ #:rewind-strategy _ #:menu-proc _)
In ice-9/boot-9.scm:
    829:9 14 (catch srfi-34 #<procedure 2cf92c0 at ./gnu/installer/steps.scm:144:7 ()> #<procedure 33e2320 at ./gnu/installer/steps.scm:144:7 (key c)> _)
    829:9 13 (catch srfi-34 #<procedure 2cfb6c0 at ./gnu/installer/steps.scm:144:7 ()> #<procedure 33e2050 at ./gnu/installer/steps.scm:144:7 (key c)> _)
    829:9 12 (catch srfi-34 #<procedure 2cfb4c0 at ./gnu/installer/steps.scm:144:7 ()> #<procedure 33e2000 at ./gnu/installer/steps.scm:144:7 (key c)> _)
    829:9 11 (catch srfi-34 #<procedure 2cfb2c0 at ./gnu/installer/steps.scm:144:7 ()> #<procedure 2e65fa0 at ./gnu/installer/steps.scm:144:7 (key c)> _)
In ./gnu/installer/steps.scm:
   182:21 10 (_)
In ice-9/eval.scm:
    619:8  9 (_ #(#(#(#<directory (guile-user) 1558140>) #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> fin…>) #))
In ./gnu/installer/keymap.scm:
    163:7  8 (_ _)
In unknown file:
           7 (scm-error misc-error #f "~A" ("Unable to locate keymap update file") #f)
In ice-9/boot-9.scm:
   751:25  6 (dispatch-exception 4 misc-error (#f "~A" ("Unable to locate keymap update file") #f))
In ice-9/eval.scm:
    619:8  5 (_ #(#(#<directory (guile-user) 1558140> #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> final-…>) …))
    619:8  4 (_ #(#(#(#<directory (guile-user) 1558140> #<<installer> name: newt init: #<procedure init ()> exit: #<procedure exit ()> exit-error: #<procedure exit-error (file key args)> f…>) …) #))
In ice-9/ports.scm:
   462:17  3 (call-with-output-file _ _ #:binary _ #:encoding _)
In ice-9/eval.scm:
    619:8  2 (_ #(#(#<directory (guile-user) 1558140> misc-error (#f "~A" ("Unable to locate keymap update file") #f)) #<output: /tmp/last-installer-error 12>))
    159:9  1 (_ #(#(#<directory (guile-user) 1558140> misc-error (#f "~A" ("Unable to locate keymap update file") #f)) #<output: /tmp/last-installer-error 12>))
In unknown file:
           0 (make-stack #t)
ice-9/eval.scm:159:9: Unable to locate keymap update file