[Bug 1844468] [NEW] Error de instalacion de grub-amd-64-signed in /target/

Public bug reported: I have a partition of HDD and Windows 8.1 with MBR, and I created a live ubuntu 19.04 usb in MBR mode through rufus, the installer forced me to create the EFI partition, I tried the boot repair and when rebooting the same black screen appears with a line of information that

[Bug 1843971] [NEW] El instalador se interrumpe cuando se instala Grub

Public bug reported: Al momento de instalar Grub el instalador ya no continua, simplemente se estropea ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: ubiquity 19.04.9 ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6 Uname: Linux 5.0.0-13-generic x86_64 ApportVersion: 2.20.10-0ubuntu2