Reproducing instructions:

sudo apt install opensbi qemu-efi-riscv64 qemu-system-riscv
cp /usr/share/qemu-efi-riscv64/RISCV_VIRT_VARS.fd .
truncate -s 16G disk.img # Creates the virtual disk file where you want to 
install Ubuntu Server
curl -L -O 
https://cdimage.ubuntu.com/ubuntu-server/daily-live/20260325/resolute-live-server-riscv64.iso
qemu-system-riscv64 \
  -cpu rva23s64 \
  -machine virt,acpi=on -m 4G -smp cpus=2 \
  -nographic \
  -drive 
if=pflash,format=raw,unit=0,file=/usr/share/qemu-efi-riscv64/RISCV_VIRT_CODE.fd,readonly=on
 \
  -drive if=pflash,format=raw,unit=1,file=RISCV_VIRT_VARS.fd,readonly=off \
  -netdev user,id=net0 \
  -device virtio-net-device,netdev=net0 \
  -device virtio-rng-pci \
  -drive file=disk,format=raw,if=none,id=DISK \
  -device virtio-blk,drive=DISK,bootindex=1 \
  -drive 
file=resolute-live-server-riscv64.iso,format=raw,readonly=on,if=none,id=ISO \
  -device virtio-blk,drive=ISO,bootindex=2


More details at:
https://github.com/ubuntu/ubuntu-manual-tests/blob/main/resolute/testsuites/Ubuntu%20Subiquity%20riscv64/Mandatory/QEMU%20riscv64%20Install.md

https://canonical-ubuntu-hardware-support.readthedocs-
hosted.com/boards/how-to/ubuntu_supported/qemu-riscv/index.html

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https://bugs.launchpad.net/bugs/2146422

Title:
  Installer UI crashed with ServerDisconnectedError

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