diff -Nru ubuntu-dev-tools-0.193ubuntu4~20.04.2/debian/changelog ubuntu-dev-tools-0.193ubuntu4~20.04.3/debian/changelog
--- ubuntu-dev-tools-0.193ubuntu4~20.04.2/debian/changelog	2023-06-07 05:00:09.000000000 +0000
+++ ubuntu-dev-tools-0.193ubuntu4~20.04.3/debian/changelog	2023-07-06 12:20:26.000000000 +0000
@@ -1,3 +1,11 @@
+ubuntu-dev-tools (0.193ubuntu4~20.04.3) focal; urgency=medium
+
+  * ubuntutools/misc.py: swap iter_content for raw stream with
+    "Accept-Encoding: identity" to fix .diff.gz downloads (LP: #2025748). This
+    fixes a regression caused by the backport of 0.193 that included this bug.
+
+ -- Robie Basak <robie.basak@ubuntu.com>  Thu, 06 Jul 2023 12:14:00 +0000
+
 ubuntu-dev-tools (0.193ubuntu4~20.04.2) focal; urgency=medium
 
   * ubuntutools/misc.py: back out a change that's incompatible with python
diff -Nru ubuntu-dev-tools-0.193ubuntu4~20.04.2/ubuntutools/misc.py ubuntu-dev-tools-0.193ubuntu4~20.04.3/ubuntutools/misc.py
--- ubuntu-dev-tools-0.193ubuntu4~20.04.2/ubuntutools/misc.py	2023-06-07 05:00:01.000000000 +0000
+++ ubuntu-dev-tools-0.193ubuntu4~20.04.3/ubuntutools/misc.py	2023-07-06 12:20:26.000000000 +0000
@@ -348,7 +348,11 @@
     with tempfile.TemporaryDirectory() as tmpdir:
         tmpdst = Path(tmpdir) / "dst"
         try:
-            with requests.get(src, stream=True, timeout=60, auth=auth) as fsrc:
+            # We must use "Accept-Encoding: identity" so that Launchpad doesn't
+            # compress changes files. See LP: #2025748.
+            with requests.get(
+                src, stream=True, timeout=60, auth=auth, headers={"accept-encoding": "identity"}
+            ) as fsrc:
                 with tmpdst.open("wb") as fdst:
                     fsrc.raise_for_status()
                     _download(fsrc, fdst, size, blocksize=blocksize)
@@ -433,7 +437,16 @@
 
     downloaded = 0
     try:
-        for block in fsrc.iter_content(blocksize):
+        while True:
+            # We use fsrc.raw so that compressed files stay compressed as we
+            # write them to disk. For example, if this is a .diff.gz, then it
+            # needs to remain compressed and unmodified to remain valid as part
+            # of a source package later, even though Launchpad sends
+            # "Content-Encoding: gzip" and the requests library therefore would
+            # want to decompress it. See LP: #2025748.
+            block = fsrc.raw.read(blocksize)
+            if not block:
+                break
             fdst.write(block)
             downloaded += len(block)
             progress_bar.update(downloaded, size)