Okay so it's a feature that has been added to Ubuntu 18.04 which automatically calls apt update after adding any PPA, sometimes it's a time saver as I don't have to run sudo apt update manually after adding a PPA. But sometimes it just pisses me off when I've to add multiple PPA's, and I've to wait for all the list updates after adding every single PPA.
Don't recommend "Can't you add multiple PPA by && ?", cause it's just pain.
Checking the help:
$ add-apt-repository --help
Usage: add-apt-repository <sourceline>
...
Options:
-h, --help show this help message and exit
-m, --massive-debug Print a lot of debug information to the command line
-r, --remove remove repository from sources.list.d directory
-s, --enable-source Allow downloading of the source packages from the
repository
-y, --yes Assume yes to all queries
-n, --no-update Do not update package cache after adding
-u, --update Update package cache after adding (legacy option)
-k KEYSERVER, --keyserver=KEYSERVER
Legacy option, unused.
So:
sudo add-apt-repository -n ppa:...
-nswitch is documented in--helpbut notman add-apt-repository(on Ubuntu 18.04 anyway) – Jeff Jan 08 '19 at 22:42-ufunctionality has been removed since 18.04, despite the misleadingmanand--help. For details, see https://askubuntu.com/questions/65245/apt-get-update-only-for-a-specific-repository/1132852#1132852 – wisbucky Apr 10 '19 at 22:50