Difference between revisions of "TroubleShooting"

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(New page: = My program does not start = If your program does not start * make sure you have execute priviledges for it using the command ls -l * make sure the program can load its libraries...)
 
imported>ThorstenStaerk
 
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* look what the problem is using the [[command]]
 
* look what the problem is using the [[command]]
 
  [[strace]]
 
  [[strace]]
 +
* if it is a script make sure it has Unix linefeeds, not DOS ones, best use
 +
dos2unix ''script''
 +
 +
= My program aborts with an error message =
 +
See [[error messages and their solutions]].
 +
 +
= Cannot do graphics =
 +
Warning: No xauth data; using fake authentication data for X11 forwarding.
 +
=> have you changed your hostname?
  
 
= My network connection is broken =
 
= My network connection is broken =
 
* [[TroubleShooting network]]
 
* [[TroubleShooting network]]
 +
 +
= Umount does not work =
 +
lsof | grep /mnt
 +
Then kill the process.
 +
 +
= root-Password is lost =
 +
To reset the root password, boot Linux with the parameter "init=/bin/bash"
 +
You get a root-shell. Enter:
 +
mount -o remount, rw /
 +
passwd
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mount -o remount,ro /
 +
and reboot
 +
 +
= find out which files are accessed by a program =
 +
To find out which files are accessed by a program start it with
 +
strace -e open ''program''
 +
 +
= Scripting =
 +
If you want every line to be shown with evaluated values, write the following to the beginning of the script:
 +
set -x
 +
or -xv for verbose
 +
 +
= TroubleShooting display =
 +
Get an problem with your display and you do not know if it is the graphics card, the monitor, or the display manager settings? See [[troubleshooting display]]
 +
 +
= TroubleShooting network =
 +
See [[troubleshooting network]]
 +
 +
= TroubleShooting sound =
 +
See [[troubleshooting sound]].
 +
 +
= TroubleShooting printers =
 +
See [[troubleshooting printers]].
 +
 +
= See also =
 +
* [[error messages]] -- error messages when running or [[build]]ing programs plus their solutions

Latest revision as of 13:47, 21 January 2015

My program does not start

If your program does not start

  • make sure you have execute priviledges for it using the command
ls -l
  • make sure the program can load its libraries using the command
ldd
  • look what the problem is using the command
strace
  • if it is a script make sure it has Unix linefeeds, not DOS ones, best use
dos2unix script

My program aborts with an error message

See error messages and their solutions.

Cannot do graphics

Warning: No xauth data; using fake authentication data for X11 forwarding.

=> have you changed your hostname?

My network connection is broken

Umount does not work

lsof | grep /mnt

Then kill the process.

root-Password is lost

To reset the root password, boot Linux with the parameter "init=/bin/bash" You get a root-shell. Enter: 

mount -o remount, rw /
passwd
mount -o remount,ro /

and reboot

find out which files are accessed by a program

To find out which files are accessed by a program start it with 

strace -e open program

Scripting

If you want every line to be shown with evaluated values, write the following to the beginning of the script: 

set -x

or -xv for verbose

TroubleShooting display

Get an problem with your display and you do not know if it is the graphics card, the monitor, or the display manager settings? See troubleshooting display

TroubleShooting network

See troubleshooting network

TroubleShooting sound

See troubleshooting sound.

TroubleShooting printers

See troubleshooting printers.

See also

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