Fix syntax to excute pressed at final installation of iso.

Signed-off-by: Alessandro Elias <ae11@c3sl.ufpr.br>

src/preseed/preseed.cfg

@@ -2,10 +2,11 @@ ubiquity ubiquity/use_nonfree boolean true
 d-i apt-setup/backports boolean false
 ubiquity ubiquity/success_command \
     string in-target apt-get -y autoremove; \
-    (packages_dir=$(find /cdrom/ -type d -name "packages-needed") && \
-    cp ${packages_dir}/* /target/var/cache/apt/archives/ && \
+    packages_dir=$(find /cdrom/ -type d -name "packages-needed") && \
+    cp -a ${packages_dir}/* /target/var/cache/apt/archives/ && \
     in-target apt-get -y install le-conf; \
-    (if grep -qi "multiseat" /etc/default/multiseat; \
-        then in-target DEBIAN_FRONTEND=noninteractive \
-        apt-get install -q -y le-multiterminal; fi); \
+    if grep -qi "multiseat" /etc/default/multiseat; then \
+    in-target DEBIAN_FRONTEND=noninteractive; \
+        apt-get install -q -y le-multiterminal; \
+    fi; \
     in-target apt-get clean