the removed two do not have GCC-9, but the newly added mirros do.
Signed-off-by: Kefu Chai <kchai@redhat.com>
if [ ! -f /usr/bin/g++-${new} ]; then
$SUDO tee /etc/apt/sources.list.d/ubuntu-toolchain-r.list <<EOF
deb [lang=none] http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu $codename main
-deb [arch=amd64 lang=none] http://mirror.cs.uchicago.edu/ubuntu-toolchain-r $codename main
-deb [arch=amd64,i386 lang=none] http://mirror.yandex.ru/mirrors/launchpad/ubuntu-toolchain-r $codename main
+deb [arch=amd64 lang=none] http://mirror.nullivex.com/ppa/ubuntu-toolchain-r-test $codename main
+deb [arch=amd64 lang=none] http://deb.rug.nl/ppa/mirror/ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu $codename main
EOF
# import PPA's signing key into APT's keyring
cat << ENDOFKEY | $SUDO apt-key add -