For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:Factory:git-workflow:staging:sbrabec:util-linux:1/openSUSE_Tumbleweed/devel:Factory:git-workflow:staging:sbrabec:util-linux:1.repo
zypper refresh
zypper install libmount1
For openSUSE Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:Factory:git-workflow:staging:sbrabec:util-linux:1/openSUSE_Factory/devel:Factory:git-workflow:staging:sbrabec:util-linux:1.repo
zypper refresh
zypper install libmount1