Ubuntu dependencies are out of date
On Ubuntu20.04, trying to execute the commands at https://root.cern/install/dependencies/#ubuntu-and-other-debian-based-distributions , I get
E: Unable to locate package openssl-dev
E: Package 'libqt4-dev' has no installation candidate
openssl-dev is substituted by libssl-dev, while I could not find a substitute package for libqt4-dev (there is no libqt-dev or libqt5-dev as far as I can tell).
#522 addresses the libssl-related part of this issue.
When using just the required packages, xrootd is turned on but cannot be built because of missing uuid, and the build system also tries to build LZMA but it fails because it's missing the aclocal command (this last one is resolved by installing autotools-dev and/or automake)
For Ubuntu 22 LTS and ROOT latest stable, this issue would be fixed by: https://github.com/root-project/web/pull/936 and https://github.com/root-project/web/pull/935