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I am getting this error trying to restart Apache, does anyone know how to fix this? Thanks,

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what command did you try to restart apache ? – sagarchalise May 4 '12 at 5:34
Are you using sudo apache2? Try apache2ctl instead. See this answer: askubuntu.com/a/147065/56343 – MantisToboggan May 8 at 6:03
do a source envvars & then run your command. – Abhi May 21 at 1:15

3 Answers

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In my case, by restarting the machine the error went away (I had just installed apache2) and I was able to issue the command sudo /etc/init.d/apache2 restart and have apache2 restart.

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A temporary fix (that I used) was to edit the file in /etc/apache2/apache2.conf. Look for this:

User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}

and change it to this:

User www-data
Group www-data

For whatever reason, apache2 isn't looking in envvars to get the appropriate environment variables. The real answer to why this is happening is to track down why envvars isn't being consulted.

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Probably an upgrade that did not affect configuration. /etc/init.d/apache2 is supposed to load this variable. You can manually extract the conffile from a deb file and replace it. – Lekensteyn Jun 5 '12 at 8:17
Really? What does your /etc/apach2/apache2.conf say around line 144? I'm wondering what it has for User and Group. This seems bizarre to me because envvars defines it and its right next to apache2.conf. – Avery Chan Jun 5 '12 at 8:25
Use apt-get download apache2.2-common and dpkg -x apache2.2-common*.deb fs to extract files to a directory called fs. You can then check it yourself. (this is at least the case with Oneiric and Precise) – Lekensteyn Jun 5 '12 at 8:51
up vote 1 down vote

To fix this problem, you have to make the changes to two separate files.

First, edit /etc/apache2/apache2.conf, adding these lines:

User www-data
Group www-data

Second, edit /etc/apache2/envvars, adding these lines:

APACHE_RUN_USER=www-data
APACHE_RUN_GROUP=www-data
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