1. last time successfully upgraded on 25 July 2017
2. yes, I have installed packages for pip installation
3. I prefer to use aptitude to update and upgrade because my purpose is only
for updating system
4. yes, I have seen on /var/lib/apt/lists here are:
oki@system:~$ ls -l /var/lib/apt/lists
total 110560
-rw-r--r-- 1 root root 6078 Jun 28 2016
es.archive.trisquel.info_trisquel_dists_belenos_InRelease
-rw-r--r-- 1 root root 40394364 Jun 28 2016
es.archive.trisquel.info_trisquel_dists_belenos_main_binary-i386_Packages
-rw-r--r-- 1 root root 22784700 Jul 8 2014
es.archive.trisquel.info_trisquel_dists_belenos_main_i18n_Translation-en
-rw-r--r-- 1 root root 33003002 Jun 28 2016
es.archive.trisquel.info_trisquel_dists_belenos_main_source_Sources
-rw-r--r-- 1 root root 4257 Jul 28 12:09
es.archive.trisquel.info_trisquel_dists_belenos-security_InRelease
-rw-r--r-- 1 root root 3379897 Jul 28 12:09
es.archive.trisquel.info_trisquel_dists_belenos-security_main_binary-i386_Packages
-rw-r--r-- 1 root root 838378 Jul 28 12:09
es.archive.trisquel.info_trisquel_dists_belenos-security_main_source_Sources
-rw-r--r-- 1 root root 5480 Jul 28 12:09
es.archive.trisquel.info_trisquel_dists_belenos-updates_InRelease
-rw-r--r-- 1 root root 9604780 Jul 28 12:02
es.archive.trisquel.info_trisquel_dists_belenos-updates_main_binary-i386_Packages
-rw-r--r-- 1 root root 3168922 Jul 28 12:03
es.archive.trisquel.info_trisquel_dists_belenos-updates_main_source_Sources
-rw-r- 1 root root0 Nov 3 2014 lock
drwxr-xr-x 2 root root 4096 Jul 29 08:42 partial