Thanks!
I have one partition for / and other one for /home .
It is possible that the files have been left from a previous installation on that partition (I guess the SLI does not format the /home partition before installing).

ale[~]$ cat /etc/fstab
proc /proc proc defaults 0 0
sysfs /sys sysfs ...

I did the following:
Inside Thunderbird, Preferences menu -> Spelling -> "Download Dictionaries" link
In the next page (Add-ons), search for Dictionaries and Language Packs.
Download and install them as add-ons (automatic)
It's working now for me

I installed Salix from the live-USB and screwed up the install because my home directory is filled with a duplication of root directories – perhaps this is why KDE doesn’t recognize my sudo password. This duplication of the root folders in home is sym-linked to various folders in /...

I ...

Happened again..
In Salix 14.2 repositories:
mozilla-thunderbird-45.5.1-x86_64-1_slack14.2
mozilla-thunderbird-l10n-xx-45.2.0-x86_64-1tg.txz

I could not find the string "Exit user setup" in salix-installer Transifex page.
It's not in salix-installer. It is in salixtools/usersetup.
Ok. I changed the string for a shorter one.

Moreover, I coudn't install Salix 14.2 in my old Pentium 4. I think 32 bits ISO is broken, because SHA1 is OK ...

Hi!
Unfortunately I can confirm this. The "Exit user setup" string got translated to "Salir de la configuración del usuario", which is just too long to fit in the screen and dialog throws an error. This sucks. Someone needs to fix the translation.

I could not find the string "Exit user setup" in ...

Hi!
I can't execute Sourcery. It freezes when I try to reinstall or uninstall any package.
In console, I see this:

Exception in thread Thread-4:
Traceback (most recent call last):
File "/usr/lib64/python2.7/threading.py", line 808, in __bootstrap_inner
self.run()
File "/usr/lib64/python2.7 ...

Thanks, Pai Me (and, obviously, Andyun)!!
Your instructions helped me make my Epson L355 printer work in Salix 14.1 64 bits.

Thanks!
With new package cairo-1.12.16-x86_64-2gv all is OK.
Solved!

In Salix 14.1, with updated package cairo-1.12.16-x86_64-1_gv, fancy plugin in ClawsMail do not work.
Back to cairo-1.12.16-x86_64-1_slack14.1 package, it works fine.
Gslapt mark cairo to be upgraded. Can I put it in excluded packages' list?