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When installing via the hd-media method, there will be a moment where you need to find and mount the Ubuntu Installer iso image in order to get the rest of the installation files. The component iso-scan does exactly this.
At first, iso-scan automatically mounts all block devices (e.g. partitions) which have some known filesystem on them and sequentially searches for filenames ending with .iso (or .ISO for that mat- ter). Beware that the first attempt scans only files in the root directory and in the first level of subdi- rectories (i.e. it finds /whatever.iso, /data/whatever.iso, but not /data/tmp/whatever.iso). After an iso image has been found, iso-scan checks its content to determine if the image is a valid Ubuntu iso image or not. In the former case we are done, in the latter iso-scan seeks for another image.
In case the previous attempt to find an installer iso image fails, iso-scan will ask you whether you would like to perform a more thorough search. This pass doesn’t just look into the topmost directories, but really traverses whole filesystem.
If iso-scan does not discover your installer iso image, reboot back to your original operating system and check if the image is named correctly (ending in .iso), if it is placed on a filesystem recognizable by debian-installer, and if it is not corrupted (verify the checksum). Experienced Unix users could do this without rebooting on the second console.
2. At medium and low priority you can always select your preferred locale from those available for the selected language (if there’s more than one).
3. Legacy locales are locales which do not use UTF-8, but one of the older standards for character encoding such as
ISO 8859-1 (used by West European languages) or EUC-JP (used by Japanese).
6.3.1.5. Configuring the Network