I have no "libicu48" installed.
Top consumers on rootfs are:
- "microb" with both /usr/lib/microb-engine and /usr/share/microb-engine
- /usr/lib/locale
- /var/lib/dpkg

I cannot "apt-get clean" downloaded package during the upgrade... as they are required for the upgrade itself, which aborts because / is full. By the way, /var/cache/apt is already diverted to /opt/var/cache/apt so it does not impact rootfs.