Hello Guix, EFI bootloader configuration causes problems to test with 'system vm' before 'reconfigure'.
To reproduce it replace default bootloader expression with following snippet in gnu/system/examples/vm-image.tmpl (bootloader (bootloader-configuration (bootloader grub-efi-bootloader) (target "/boot/efi"))) --8<---------------cut here---------------start------------->8--- [ 0.909226] EXT4-fs (vda1): mounted filesystem with ordered data mode. Opts: (null) installing bootloader... /gnu/store/b1kdjsmwkphwh06gcm2ym0d0zh5wf4gc-grub-efi-2.02/sbin/grub-install: error: /gnu/store/b1kdjsmwkphwh06gcm2ym0d0zh5wf4gc-grub-efi-2.02/lib/grub/i386-pc/modinfo.sh doesn't exist. Please specify --target or --directory. ERROR: In procedure scm-error: ERROR: failed to install GRUB (EFI) Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue. GNU Guile 2.2.2 Copyright (C) 1995-2017 Free Software Foundation, Inc. Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'. This program is free software, and you are welcome to redistribute it under certain conditions; type `,show c' for details. Enter `,help' for help. scheme@(guile-user)> [ 1.344109] tsc: Refined TSC clocksource calibration: 3392.250 MHz [ 1.344677] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x30e5b54dbe0, max_idle_ns: 440795272496 ns C-c C-c --8<---------------cut here---------------end--------------->8---