Create apt guide with lock problem fix

Guides/apt.md

@@ -0,0 +1,27 @@
+# Apt
+
+Package manager
+
+## Problem with lock file
+
+If you get the error :
+```
+E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
+E: Unable to lock the administration directory (/var/lib/dpkg/) is another process using it?
+```
+
+You can try two soltutions.
+
+### Soft
+
+Kill the process owner.
+
+`pgrep -a apt`
+
+`sudo kill processnumber`
+
+### Hard
+
+Erase the file.
+
+`sudo rm /var/lib/apt/lists/lock`