grubcfg_proxy comes from grub-customizer, which is an obsolete package
from 20.04.
I'd advise purging it if it still there using:
sudo apt-get purge grub-customizer
** Changed in: memtest86+ (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2133429
Title:
package memtest86+ 7.00-1build1 failed to install/upgrade: el
subproceso instalado paquete memtest86+ script post-installation
devolvió el código de salida de error 127
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