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I use Ubuntu 16.04. Since few days when I try to install an application I receive the following error message below.

For example, today the following :

$ sudo apt-get install sublime-text-installer

Provides the following error message :

E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

I also tried to resolve the issue as advised here, using the followings commands :

$sudo lsof /var/lib/dpkg/lock
$sudo lsof /var/lib/apt/lists/lock
$sudo lsof /var/cache/apt/archives/lock

Then :

$sudo kill -9 <process_id>

Then the commands below :

$sudo rm /var/lib/apt/lists/lock
$sudo rm /var/cache/apt/archives/lock
$sudo rm /var/lib/dpkg/lock

Then the command :

$sudo dpkg --configure -a

However, when enter again the command below I have a frame asking to hit "OK" while it's not possible (as you can see in the file attached):

$ sudo apt-get install sublime-text-installer

The issue may come from Software Center/Ubuntu Software since it doesn't launch.enter image description here

Thanks in advance for your help.

  • Did you try the spacebar? – George Udosen May 7 at 9:48
  • Since OK is marked, pressing <Enter> should do the trick. If more choices where available, you could navigate between then with tab-key. – Soren A May 7 at 9:50
  • I tried <Enter> but nothing happened. – Space May 7 at 10:20
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From /var/lib/dpkg/info/ttf-mscorefonts-installer.postinst you can find the value to pre-accept the EULA

# if the license was not accepted, ensure the fonts are removed
# and add README with helpful information
 FONTDIR=/usr/share/fonts/truetype/msttcorefonts
 mkdir -p $FONTDIR
 license=mscorefonts-eula
 db_get msttcorefonts/accepted-$license
 if [ "$RET" != "true" ]; then
     echo "user did not accept the $license license" >&2
    rm -f $FONTDIR/*.ttf
    cat > $FONTDIR/README <<EOF 
License refused.

So we can use the debconf-set-selections utility:

echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true
| sudo debconf-set-selections
sudo apt-get install ttf-mscorefonts-installer

Then install:

sudo apt-get install sublime-text-installer
| improve this answer | |
  • I still recurrently having the error message above. Maybe I should re-install linux. – Space May 7 at 10:25
  • ps aux | grep [a]pt ? – kortewegdevries May 7 at 10:28
  • I've re-installed Ubuntu. I believe I presently face hackers attacks. – Space May 12 at 8:22

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