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I just installed on a brand new machine the TeXlive 2017 using Enrico Gregorio's guide.

Everything is fine except for the fact that when I launch the tlmgr I get the following error:

afcuttin@millenium-falcon:~/idic-comml$ sutlmgr
Loading local TeX Live database
(/usr/local/texlive/2017/tlpkg/texlive.tlpdb)
This may take some time, please be patient ...
bad pad value "2m": must be positive screen distance at 
/usr/lib/x86_64-linux-gnu/perl5/5.22/Tk/Widget.pm line 1218.
at /usr/local/texlive/2017/texmf-dist/scripts/texlive/tlmgrgui.pl line 295.
Compilation failed in require at /opt/texbin/tlmgr line 4724.

the command sutlmg is just an alias for sudo /opt/texbin/tlmgr -gui as per the installation guide.

Unfortunately it seems that Google is not my friend at finding a solution to this error.

closed as off-topic by Alessandro Cuttin, user36296, Zarko, TeXnician, Mico Aug 4 '17 at 16:10

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    This seems more a problem with Perl-Tk, rather than with any TeX Live part. – egreg Aug 3 '17 at 8:00
  • @egreg thanks for your comment. where do you think it can be more appropriate to notify this issue? – Alessandro Cuttin Aug 3 '17 at 9:13
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    The TeX Live mailing list seems more appropriate: tug.org/mailman/listinfo/tex-live – egreg Aug 3 '17 at 9:28
  • further information about this possible bug: the error happens only if my computer (a dell xps 15) is connected to the d3100 docking station (with monitors attached to it). The TeXlive manager works properly if the computer is detached from the docking station. – Alessandro Cuttin Aug 4 '17 at 15:35
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    I'm voting to close this question as off-topic because it probably it is of interest of the TeXlive developers – Alessandro Cuttin Aug 4 '17 at 15:37