Package: udisks

"udisks" package binaries on CentOS:

/sbin/umount.udisks /usr/bin/udisks

You may install this package on CentOS with yum install udisks

"udisks" package binaries on Debian:

/sbin/umount.udisks /usr/bin/udisks /usr/bin/udisks-tcp-bridge

You may install this package on Debian with apt-get install udisks