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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.

Gianluca Massimiani
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    Unfortunately, support for 14.10 has reached EOL (End of Life) on July 23, 2015. Considering upgrading to current supported releases, or do a fresh install. – Liso Dec 10 '16 at 14:17

1 Answers1

14

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 http://old-releases.ubuntu.com/ubuntu/ utopic main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ utopic main restricted
deb http://old-releases.ubuntu.com/ubuntu/ utopic-updates main restricted
deb-src http://old-releases.ubuntu.com/ubuntu/ utopic-updates main restricted
deb http://old-releases.ubuntu.com/ubuntu/ utopic universe multiverse
deb-src http://old-releases.ubuntu.com/ubuntu/ utopic universe multiverse
deb http://old-releases.ubuntu.com/ubuntu utopic-security main restricted
deb-src http://old-releases.ubuntu.com/ubuntu utopic-security main restricted
deb http://old-releases.ubuntu.com/ubuntu/ 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
kyodake
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