Не мог обновить rkhunter

Сегодня, когда я выполнил команду (который я выполняю каждый день, и все хорошо):

sudo rkhunter --update

Для проверки на обновления файлов базы данных, я получил эту ошибку каждый раз:

[ Rootkit Hunter version 1.4.2 ]

Checking rkhunter data files...
  Checking file mirrors.dat                                  [ Update failed ]
  Checking file programs_bad.dat                             [ Update failed ]
  Checking file backdoorports.dat                            [ Update failed ]
  Checking file suspscan.dat                                 [ Update failed ]
  Checking file i18n versions                                [ Update failed ]

Please check the log file (/var/log/rkhunter.log)

Таким образом, я проверил файл журнала, и это было его содержанием:

[11:52:57] Checking rkhunter data files...
[11:52:57] Info: Created temporary file '/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5'
[11:52:57] Info: Created temporary file '/var/lib/rkhunter/tmp/mirrors.dat.9HiKnqrCFB'
[11:52:57] Info: The mirrors file has been rotated: /var/lib/rkhunter/db/mirrors.dat
[11:52:57] Info: Executing download command '/usr/bin/wget  -q -O "/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5" http://rkhunter.sourceforge.net/1.3/mirrors.dat 2>/dev/null'
[11:52:57] Warning: Download of 'mirrors.dat' failed: Unable to determine the latest version number.
[11:52:57] Checking file mirrors.dat                         [ Update failed ]
[11:52:57] Info: Executing download command '/usr/bin/wget  -q -O "/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5" http://rkhunter.sourceforge.net/1.3/programs_bad.dat 2>/dev/null'
[11:52:58] Warning: Download of 'programs_bad.dat' failed: Unable to determine the latest version number.
[11:52:58] Checking file programs_bad.dat                    [ Update failed ]
[11:52:58] Info: Executing download command '/usr/bin/wget  -q -O "/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5" http://rkhunter.sourceforge.net/1.3/backdoorports.dat 2>/dev/null'
[11:52:58] Warning: Download of 'backdoorports.dat' failed: Unable to determine the latest version number.
[11:52:58] Checking file backdoorports.dat                   [ Update failed ]
[11:52:58] Info: Executing download command '/usr/bin/wget  -q -O "/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5" http://rkhunter.sourceforge.net/1.3/suspscan.dat 2>/dev/null'
[11:52:58] Warning: Download of 'suspscan.dat' failed: Unable to determine the latest version number.
[11:52:58] Checking file suspscan.dat                        [ Update failed ]
[11:52:58] Info: Executing download command '/usr/bin/wget  -q -O "/var/lib/rkhunter/tmp/rkhunter.upd.5ztlaw3od5" http://rkhunter.sourceforge.net/1.3/i18n/1.4.2/i18n.ver 2>/dev/null'
[11:52:59] Checking file i18n versions                       [ Update failed ]
[11:52:59] Warning: Download of 'i18n.ver' failed: Unable to determine the latest version number.
[11:52:59]
[11:52:59] Info: End date is Fri Jul 17 11:52:59 BST 2015

При выполнении этой команды:

sudo rkhunter --versioncheck

Я также получаю подобную ошибку:

[ Rootkit Hunter version 1.4.2 ]

Checking rkhunter version...
  This version  : 1.4.2
  Latest version: Download failed

Почему это? И как я могу зафиксировать его? Или это - не что-то мой конец? В этом случае, что я должен сделать?

Информация об ОС:

Description:    Ubuntu 15.04
Release:    15.04

Информация о пакете:

rkhunter:
  Installed: 1.4.2-0.4
  Candidate: 1.4.2-0.4
  Version table:
 *** 1.4.2-0.4 0
        500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
        100 /var/lib/dpkg/status