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This most likely has nothing to do with rospack or um7, but with misconfigured locales.

According to this page and this SO post, the following commands in a terminal should fix it:

$ export DEBIAN_FRONTEND=noninteractive
$ apt-get install locales
$ echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
$ locale-gen

Note: be sure to use an appropriate locale string for your language / region. If you're ok with US English (and regional settings), then en_US.UTF-8 should work.

This most likely has nothing to do with rospack or um7, but with misconfigured locales.

According to this page and this SO post, the following commands in a terminal should fix it:it on Ubuntu:

$ export DEBIAN_FRONTEND=noninteractive
$ sudo apt-get install locales
$ echo "en_US.UTF-8 UTF-8" > /etc/locale.gen
sudo sh -c "echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen"
$ sudo locale-gen

Note: be sure to use an appropriate locale string for your language / region. If you're ok with US English (and regional settings), then en_US.UTF-8 should work.

This most likely has nothing to do with rospack or um7, but with misconfigured locales.

According to this page and this SO post, the following commands in a terminal should fix it on Ubuntu:

$ export DEBIAN_FRONTEND=noninteractive
$ sudo apt-get install locales
$ sudo sh -c "echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen"
$ sudo locale-gen

Alternatively: review your locale settings and regenerate the appropriate ones using whatever commands are suitable for your Linux distribution and platform.

Note: be sure to use an appropriate locale string for your language / region. If you're ok with US English (and regional settings), then en_US.UTF-8 should work.

This most likely has nothing to do with rospack or um7, but with misconfigured locales.

According to this page and this SO post, the following commands in a terminal should fix it on Ubuntu:

$ export DEBIAN_FRONTEND=noninteractive
$ sudo apt-get install locales
$ sudo sh -c "echo 'en_US.UTF-8 UTF-8' >> /etc/locale.gen"
$ sudo locale-gen

Alternatively: review your locale settings and regenerate the appropriate ones using whatever commands are suitable for your Linux distribution and platform.

Note: be sure to use an appropriate locale string for your language / region. If you're ok with US English (and regional settings), then en_US.UTF-8 should work.

Edit: can you show us the output of whoami and id -u and id -g?