i have ubuntu it was working fine but now i cannot execute any command
no sudo i cannot go to group and user etc..
any help please

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I have no idea... What the error when you try to use command sudo? Would it be not found? Or would it be unable to resolve?

Did you make a new user and it doesn't have sudo permissions?

You are not providing nearly enough information to help you. Saying "I have a problem - please fix it." is not productive. Tell us what your were doing when it stopped working, and what you did just before it stopped working, IN DETAIL.

no i did not make any new user..
i cannot install any software via the terminal i cannot add or view user and groups..and if i write sudo in terminal i get this error
sudo: /usr/lib/sudo/sudoers.so must be only be writable by owner
sudo: fatal error, unable to load plugins

Did you run some kind of CHMOD -R command on that path? / or /usr or /usr/lib ?

Can you check your history?
history | grep chmod

You could try a very nice trick which I used recently to restart a ubuntu PC without the password

- Restart the computer and in Grub, choose *Recovery Mode*
- In the menu, choose *root*
- In the terminal type
    mount -o rw,remount /
    passwd <YOUR USER NAME>

After the mount, you're root and you should be able to install software.

not working with recovery mode
history of chmod

34  chmod +x netbeans.sh
   37  chmod +x netbeans.sh
   45  sudo chmod a+x eclipse
   46  sudo chmod a+x eclipse.run
   50  chmod +x eclipse.run
   51  chmod -R 777 /local/java
   52  chmod -R 777 /local/java
   54  chmod -R 777 /local
   55  chmod -R 777 / local
   56  chmod -R 777 / local /java
   57  chmod -R 777 /local/java
   58  chmod -R 777 /local/java
   59  sudo chmod -R 777 /local/java
   60  sudo chmod -R 777 /local
   63  sudo chmod -R 777 usr/local/java
   65  sudo chmod -R 777 usr/local/java
   67  sudo chmod -R 777 usr/local
   68  sudo chmod -R 777 usr /local
   69  sudo chmod 754 /usr/local/java
   72  sudo chmod 755 /usr/local/java
   73  chmod 775 /usr/folder/java
   74  sudo chmod 775 /usr/folder/java
   76  sudo chmod 775 /folder/java
   77  sudo chmod 775 /folder/java
   80  sudo chmod 0777 -R /local/java/
   90  chmod a+x jdk.bin
   99  chmod +x jdk.sh
  103  chmod +x netbeans.sh
  222  chmod o+x /usr/bin/add-apt-repository.sh
  248  sudo chmod +x xampp-linux-x64-1.8.3-2-installer.run
  250  sudo chmod +x xampp-linux-x64-1.8.3-2-installer.run
  251  chmod +x xampp-linux-x64-1.8.3-2-installer.run
  252  sudo chmod +x xampp-linux-x32-1.8.3-2-installer.run
  253  chmod +x xampp-linux-1.8.2-0-installer.run
  256  sudo chmod +x xampp-linux-x64-1.8.3-2-installer.run
  257  sudo chmod +x xampp-linux-x32-1.8.3-2-installer.run
  433  sudo chmod -R 777 /usr
  484  pkexec chmod go-w /usr/lib/sudo/sudoers.so
  487  chmod -R a+rx /etc/sudoers.d
  488  chmod -R u+w /etc/sudoers.d

Yep - There it is: sudo chmod -R 777 /usr
That command added 777 rights to everything under /usr.

At the very least, you should do:
sudo chmod 644 /usr/lib/sudo/sudoers.so

i tried this command in normal mode and recovery mode and i have this error
unable to load plugins

i cannot change the date,the network is disabled i cannot enables it..i cannot start mysql no apache,i cannot install any software from command line etc..

I would backup and reinstall if I were you. Why did you run these chmod -R commands on system files ?

You're not the first one to do such thing, look at this answer.

I always use a separate partition for /home, in case something like this happens.

is there a good software to backup and reinstall without infecting my programs and data...

You can backup your user data with luckybackup, which is a GUI interface to rsync. Boot with a live ubuntu CD, install luckybackup, visit your hard drive with the file manager, plug in an external drive, and define a backup task in luckybackup.

For a faster way, use a tar cpvzf command to create a gunzipped version of your home folder.

Notice that I'm a beginner, as far as backup is concerned :)

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