tracked it down to this lines in the file
dpkg-1.18.4ubuntu1/lib/dpkg/parsehelp.c at the end of function
parseversion() at line #186:
/* XXX: Would be faster to use something like cisversion and cisrevision. */
ptr = rversion->version;
if (*ptr && !c_isdigit(*ptr++))
return dpkg_put_warn(err, _("version number does not start with digit"));
for (; *ptr; ptr++) {
if (!c_isdigit(*ptr) && !c_isalpha(*ptr) && strchr(".-+~:", *ptr) == NULL)
return dpkg_put_warn(err, _("invalid character in version number"));
}
for (ptr = rversion->revision; *ptr; ptr++) {
if (!c_isdigit(*ptr) && !c_isalpha(*ptr) && strchr(".+~", *ptr) == NULL)
return dpkg_put_warn(err, _("invalid character in revision number"));
}
quick rationale:
no underscores/colon(revision only)/special-chars/others allowed at present for
neither version number nor the revision number.
valid design as of now for version item:
* start with a digit.
* continue with digit, alpha or ".-+~:" chars.
* terminate with a zero char.
valid design as of now for revision item:
* start/continue with digit, alpha or ".+~" chars.
* terminate with a zero char.
a sequence of "x86_64" would not work for any these strings => underscore!
a sequence of "3.4.5@home" would not work for any these strings => at-sign!
a sequence of "3:1.45" would not work for the revision string => colon!
a sequence of "3-4-5" would not work for the revision string => any dash! (the
warn message would be raised for the first occurrence)
your sequence of "1:0.9.12.2+6.04.20160823-0ubuntu1" does not work =>
special char included! rectangular box here in the view. it might be
some extended OEM char or a UTF-8 char or an unicode char or whatever.
either it sneaked in originally, or it was added later on - even a
backspace, CTRL+C or line break might be the root cause. You should be
able to trace it down on your own.
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https://bugs.launchpad.net/bugs/1701756
Title:
dpkg reports invalid character in version number on package 'compiz'
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