Exception while marshalling /opt/android-sdk/*/*/package.xml. Probably the SDK is read-only

See on a buildserver, azure, bullseye-1000:

...
DEBUG: buildserver > Checking the license for package Android SDK Build-Tools 31 in /opt/android-sdk/licenses
DEBUG: buildserver > License for package Android SDK Build-Tools 31 accepted.
DEBUG: buildserver > Preparing "Install Android SDK Build-Tools 31 (revision: 31.0.0)".
DEBUG: buildserver > "Install Android SDK Build-Tools 31 (revision: 31.0.0)" ready.
DEBUG: buildserver > Installing Android SDK Build-Tools 31 in /opt/android-sdk/build-tools/31.0.0
DEBUG: buildserver > "Install Android SDK Build-Tools 31 (revision: 31.0.0)" complete.
DEBUG: buildserver > "Install Android SDK Build-Tools 31 (revision: 31.0.0)" finished.
DEBUG: buildserver > Checking the license for package Android SDK Platform 31 in /opt/android-sdk/licenses
DEBUG: buildserver > License for package Android SDK Platform 31 accepted.
DEBUG: buildserver > Preparing "Install Android SDK Platform 31 (revision: 1)".
DEBUG: buildserver > "Install Android SDK Platform 31 (revision: 1)" ready.
DEBUG: buildserver > Installing Android SDK Platform 31 in /opt/android-sdk/platforms/android-31
DEBUG: buildserver > "Install Android SDK Platform 31 (revision: 1)" complete.
DEBUG: buildserver > "Install Android SDK Platform 31 (revision: 1)" finished.
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/19.1.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/20.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/21.1.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/22.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/23.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/23.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/23.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/24.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/24.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/24.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/24.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/25.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/25.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/25.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/25.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/26.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/26.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/26.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/26.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/27.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/27.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/27.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/27.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/28.0.0/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/28.0.1/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/28.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/28.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/29.0.2/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/build-tools/29.0.3/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/extras/android/m2repository/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platform-tools/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-10/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-11/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-12/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-13/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-14/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-15/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-16/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-17/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-18/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-19/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-20/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-21/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-22/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-23/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-24/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-25/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-26/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-27/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-28/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-29/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-7/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-8/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/platforms/android-9/package.xml. Probably the SDK is read-only
DEBUG: buildserver > Exception while marshalling /opt/android-sdk/tools/package.xml. Probably the SDK is read-only
...