Не удается переустановить Adobe Reader

Я случайно удалил файлы в / opt /, который также включал каталог Adobe, в который был установлен ридер. Теперь я пытаюсь переустановить его, используя команду

sudo apt-get install acroread

. В этом после нескольких строк я получаю следующую ошибку

    amit@localhost:~$ sudo apt-get install aroread
[sudo] password for amit: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package aroread
amit@localhost:~$ sudo apt-get install acroread
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  nspluginviewer:i386 nspluginwrapper
The following NEW packages will be installed:
  acroread nspluginviewer:i386 nspluginwrapper
0 upgraded, 3 newly installed, 0 to remove and 6 not upgraded.
Need to get 0 B/218 kB of archives.
After this operation, 649 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Preconfiguring packages ...
Selecting previously unselected package nspluginviewer:i386.
(Reading database ... 173632 files and directories currently installed.)
Unpacking nspluginviewer:i386 (from .../nspluginviewer_1.4.4-0ubuntu4_i386.deb) ...
Selecting previously unselected package nspluginwrapper.
Unpacking nspluginwrapper (from .../nspluginwrapper_1.4.4-0ubuntu4_amd64.deb) ...
Selecting previously unselected package acroread.
Unpacking acroread (from .../acroread_9.5.5-1precise1_amd64.deb) ...
Processing triggers for man-db ...
Setting up nspluginviewer:i386 (1.4.4-0ubuntu4) ...
Setting up nspluginwrapper (1.4.4-0ubuntu4) ...
plugin dirs:
nspluginwrapper: no appropriate viewer found for /usr/lib/flashplugin-installer/libflashplayer.so
Auto-update plugins from /usr/lib/mozilla/plugins
Looking for plugins in /usr/lib/mozilla/plugins
Auto-update plugins from /usr/lib/firefox/plugins
Looking for plugins in /usr/lib/firefox/plugins
Auto-update plugins from /root/.mozilla/plugins
Looking for plugins in /root/.mozilla/plugins
Setting up acroread (9.5.5-1precise1) ...
No LSB modules are available.
nspluginwrapper: /opt/Adobe/Reader9/Browser/intellinux/nppdf.so is not a valid NPAPI plugin
No LSB modules are available.
nspluginwrapper: /opt/Adobe/Reader9/Browser/intellinux/nppdf.so is not a valid NPAPI plugin

Я не уверен, что это значит под LSB модули.