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I am trying to install the Geant4.10.04.p02 on Ubuntu 18.04 and when I switch the environment-variables using the command sudo vi /etc/profile.d/geant4.sh and restart Ubuntu gives an error. How can I login to Ubuntu again?

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karel
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Mohammad Hmodi
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    Those are warnings, not fatal errors, and basically they shouldn't prevent you from logging in. OTOH, there should be a clickable OK button, but due to the large number of failures it seems to not be visible.,. – Gunnar Hjalmarsson Jul 20 '18 at 12:19
  • Yes thank you. Now I can access the desktop. Did you mean that the changes that I made for the Geant4 environment-variables are correct – Mohammad Hmodi Jul 21 '18 at 20:18
  • No, that's not what I meant. I mean that a failure at login to read that file should generate warnings, but shouldn't prevent you from logging in. I don't know what the file looks like now, but the one which caused the above message was certainly not correct. – Gunnar Hjalmarsson Jul 21 '18 at 20:24
  • OK . I am sorry for the misunderstanding. Thank you again, the file is not currently working and I am working to fix it. Greetings to you – Mohammad Hmodi Jul 21 '18 at 20:31

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Edit: looking at the error message again, it seems like you specified relative paths where absolute paths were expected, so deleting may be overkill.

The error message clearly states that geant4.sh is trying to cd to directories that don't exist. Thus, the X session is not started. To be able to use the desktop environment again, fix, move or delete geant4.sh:

Hit Ctrl+Alt+F4 to switch to tty4. Login with your username and password. Then run the following command to edit the file:

sudo vi /etc/profile.d/geant4.sh

Or, to remove it:

sudo rm /etc/profile.d/geant4.sh

Alternative 1: You can boot Ubuntu in recovery mode and access the file from a root shell.

Alternative 2: You can boot a live system and access the file from there.

danzel
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  • Thank you I put my username and password correctly but ask me login incorrect – Mohammad Hmodi Jul 20 '18 at 10:36
  • It's possible that there is a different keyboard layout. Try entering your password on the login prompt (where you see the characters you typed) and see if the correct characters are produced. – danzel Jul 20 '18 at 10:46