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I had a problem where I could not save a c++ source file from anjuta using the gtksourceview plugin, but could using the scintilla plugin. I would get an error message with "invalid byte sequence in conversion input" in the text. Eclipse CDT also would not save a modified file with a similar error message.
The fix was to uncomment the proper lines in the file /etc/locale.gen for my locale and run locale-gen as described in the Archlinux wiki article "Configuring locales."
I did not find any help for this problem using internet searches, so I thought I would document it here. Just in case someone else fails to setup their locale and runs into the same trouble.
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