Thanks for taking your time to report this issue and help making Ubuntu better.
This particular issue has already been reported as bug 1455522, so I'm marking this as a duplicate. The good news is that the typo is fixed in newer versions (available in 17.10 and later), unfortunaly it probably won't be updated for 16.04 unless it can piggyback other changes which need to be backported to 16.04.
Thanks for taking your time to report this issue and help making Ubuntu better.
This particular issue has already been reported as bug 1455522, so I'm marking this as a duplicate. The good news is that the typo is fixed in newer versions (available in 17.10 and later), unfortunaly it probably won't be updated for 16.04 unless it can piggyback other changes which need to be backported to 16.04.