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Add Ubuntu 26.04 cloud image

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Download the Ubuntu 26.04 LTS server cloud image (release 20260927) for
amd64 and arm64 from the TUNA, NJU and official mirrors, verified with the
pinned SHA256 checksums from the release's SHA256SUMS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Kwxp2XWvKnuEBifnCbhyX5
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GuofangandClaude Opus 5.5 committed 2026-10-15 09:00:08 +08:00
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commit 6286495d27
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README.md
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@@ -18,6 +18,7 @@ Download or check selected targets:
./download-images.sh debian13
./download-images.sh almalinux10
./download-images.sh fedora44
./download-images.sh ubuntu2604
./download-images.sh virtio-win
```
@@ -36,6 +37,7 @@ The path interface prints one absolute path without downloading anything:
./download-images.sh --print-path debian13
./download-images.sh --print-path almalinux10
./download-images.sh --print-path fedora44
./download-images.sh --print-path ubuntu2604
./download-images.sh --print-path virtio-win
./download-images.sh --print-path windows11
./download-images.sh --print-path windows11 --iso
@@ -48,13 +50,14 @@ ISO (for example `Win11_25H2_English_x64_v2.iso` →
existing `*Win*11*x64*.qcow2` in `base-qcow2/` is used instead.
Download URLs can be overridden with `DEBIAN_IMAGE_URL`, `ALMA_IMAGE_URL`,
`FEDORA_IMAGE_URL`, and `VIRTIO_WIN_ISO_URL`. Each may list several mirrors of
the same file, separated by whitespace; the Fedora image defaults to the TUNA,
BFSU and NJU mirrors.
`FEDORA_IMAGE_URL`, `UBUNTU_IMAGE_URL`, and `VIRTIO_WIN_ISO_URL`. Each may
list several mirrors of the same file, separated by whitespace; the Fedora
image defaults to the TUNA, BFSU and NJU mirrors, and the Ubuntu image to the
TUNA, NJU and official cloud-images.ubuntu.com mirrors.
When [aria2](https://aria2.github.io/) is installed (`aria2c`), an image is
downloaded from all of its mirrors at once, with a single connection to each
mirror. Without it, `curl` (or `wget`) tries the mirrors in order. A partial
download is only resumed with the same downloader and mirror list; otherwise
it starts over. The Fedora checksum can be
overridden with `FEDORA_IMAGE_SHA256` when using a custom image.
it starts over. The Fedora and Ubuntu checksums can be overridden with
`FEDORA_IMAGE_SHA256` and `UBUNTU_IMAGE_SHA256` when using a custom image.