deb creation permission error

[Kirk Larsen]

I am attempting to build chromium from source on my Ubuntu 25.10 box. I can build and run the browser, but I would like to copy or zip only the files needed to run it. When I try to build the deb package using this command:
autoninja -C out/Default "chrome/installer/linux:unstable_deb"

It gives me this:
err: exit=1
python3 ../../build/gn_run_binary.py installer/debian/build.sh -a amd64 -b 1763689419 -c unstable -d chromium -o . -s ../../build/linux/debian_bullseye_amd64-sysroot -t linux -f
build step: __chrome_installer_linux_unstable_deb___build_toolchain_linux_clang_x64__rule "./chromium-browser-unstable_144.0.7537.0-1_amd64.deb"
stdout:
installer/debian/build.sh failed with exit code 1
stderr:
Expected permissions on opt to be 755, but they were 775

[Lei Zhang]

Is the umask value set to 002 instead of 022? This is on your machine,
so you'll need to figure out why the opt sub-directory within the
staging directory got created with unexpected permission values.

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