I am very new to Linux. I am using Xubuntu 14.10 on vmware and I am trying to make an executable. I typed make in the terminal, but the process stopped because of the error:
flex -Pfct_pddl lex-fct_pddl.l make: flex: Command not found makefile:66: recipe for target 'lex.fct_pddl.c' failed make: *** [lex.fct_pddl.c] Error 127 From what I understand I need to install flex. I tried to go with this:
sudo apt-get install flex but I got this:
Package flex is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source E: Package 'flex' has no installation candidate Any idea of what I should do? Thanks.
11 Answer
Try this:
Open a terminal,
Press Ctrl+Alt+T
Run it:
sudo -i nano /etc/apt/sources.list In the open file, delete its contents and put this:
deb utopic main restricted deb-src utopic main restricted deb utopic-updates main restricted deb-src utopic-updates main restricted deb utopic universe multiverse deb-src utopic universe multiverse deb utopic-security main restricted deb-src utopic-security main restricted deb utopic-backports main restricted universe multiverse Ctrl+O Save File
Ctrl+X Close Nano
Continue running:
apt-get update apt-get dist-upgrade apt-get install flex 
