/etc/default/yum-updatesd is in yum 3.2.25-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # yum-updatesd is used to warn you about the fact that some RPMs might be
# outdated on your system, and need an update.
# As I think that in most cases, we don't need to run the yum-updatesd
# daemon in Debian (yum is used for another purpose than managing the
# system itself, like bootstraping foreign systems), I have decided to
# disable this daemon by default. If you want to re-enable it, just set this
# variable to yes (lower case please). Any other value will disable it.
START_YUM_UPDATESD=no
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