Не может установить сервер ntp

Просто добавьте libopts25 наряду с ntp как это sudo apt-get install ntp libopts25:

$ sudo apt-get install ntp
Reading package lists... Done
Building dependency tree      
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
ntp : Depends: libopts25 (>= 1:5.18.7) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

$ sudo apt-get install ntp libopts25
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Suggested packages:
 ntp-doc
The following NEW packages will be installed:
 libopts25 ntp
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
Need to get 576 kB of archives.
After this operation, 1,792 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 libopts25 amd64 1:5.18.7-3 [57.8 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ntp amd64 1:4.2.8p4+dfsg-3ubuntu5.6 [518 kB]
Fetched 576 kB in 0s (615 kB/s)
Selecting previously unselected package libopts25:amd64.
(Reading database ... 207420 files and directories currently installed.)
Preparing to unpack .../libopts25_1%3a5.18.7-3_amd64.deb ...
Unpacking libopts25:amd64 (1:5.18.7-3) ...
Selecting previously unselected package ntp.
Preparing to unpack .../ntp_1%3a4.2.8p4+dfsg-3ubuntu5.6_amd64.deb ...
Unpacking ntp (1:4.2.8p4+dfsg-3ubuntu5.6) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
Processing triggers for systemd (229-4ubuntu19) ...
Processing triggers for ureadahead (0.100.0-19) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up libopts25:amd64 (1:5.18.7-3) ...
Setting up ntp (1:4.2.8p4+dfsg-3ubuntu5.6) ...

Можно установить использование сервера ntp после команд:

, Если Вы используете использование сервера человечности sudo apt-get install ntp.

, Если Вы используете песни или RHEL затем, используют sudo yum install ntp.

, Если это не работает, попытка, обновляющая источник, перечисляет repo.