devel-su likely doesn't exist on that device, as it is part of 'busybox-devel-su' package, which is installed with developer mode:

...
Package: developer-mode
Status: install ok installed
Priority: extra
Section: user/utilities
Installed-Size: 84
Maintainer: Nokia <I_EXT_HARMATTAN_DEVELOPERS@nokia.com>
Architecture: armel
Version: 1.48+0m6
Depends: duicontrolpanel-devmodeapplet (>= 1.14), develsh (>= 1.17), develsh (<< 1.18), sdk-connectivity-tool, meego-terminal, openssh-client, openssh-server, gdbserver, aegis-developer-unknown-source-policy (>= 1.26), aegis-dev-mode, busybox-devel-su, less, simple-syslog-daemon | sysklogd | system-log-daemon
Description: Developer Mode
...

Can you try to fetch the logs with file manager?