Debian GNU/Hurd FAQ. See also the [[Hurd_FAQ|hurd/FAQ]] and [[after_install]]. [[toc ]] # `df` There is no `/etc/mtab`, so just running `df` will yield an error. Pass `df` a path like `df /` or `df ./` to see the disk usage of that particular file system. # `sshd` You need to disable `PriviledgeSeperation` in `/etc/ssh/sshd\_options`. Also make sure you have `/dev/random`, see below. # `/dev/random` There is no random device by default as no secure implementation has been finished yet. An easy (but very insecure) work-around is to copy a binary file like `/bin/bash` to `/dev/random` and `/dev/urandom`. # Hurd Console Edit `/etc/default/hurd-console` to configure the Hurd console and enable it on bootup. See [[console]] for further information about the Hurd console. # Swap # 2 GiB Partition Limit The 2 GiB limit has been removed in Debian GNU/Hurd. # Free Memory Run `vmstat` to see memory and swap usage. # Translators # 512 MiB RAM Limit GNU Mach does not cope well with lots of memory. Newer versions of the Debian `gnumach` package will limit themselves to around 1 GiB of memory. If you have an older version, or still experience problems with `vmstat` (see above) reported much less memory than you have, the best is to limit the memory it can see via GRUB's `upppermem` feature. Add `uppermem 786432` to GRUB's Hurd entry in `menu.lst`. This should be fixed. # `xserver-common` You need to run `dpkg-reconfigure xserver-common` and select `Anybody` for starting X as there is no way to detect console users currently. # Reporting Bugs Please try to reproduce bugs which are not obviously Hurd-specific on Debian GNU/Linux and then file them there. If you find a genuine issue in Debian GNU/Hurd, please file it in our Alioth bug tracker at [http://alioth.debian.org/tracker/?atid=411594&group\_id=30628&func=browse](http://alioth.debian.org/tracker/?atid=411594&group_id=30628&func=browse) If you find a bug in the Hurd or GNU Mach themselves, either file a bug against the respective Debian packages, or directly at # `ps` Hangs If `ps` hangs, try `ps -M` which might still work. # Porting Packages # Debugging inside glibc To get [[debugging]] information for glibc, you need to install the `libc0.3-dbg` package. At the place [[debugging/GDB]] looks for debugging symbols by default (`/usr/lib/debug/lib/`), Debian's `libc0.3-dbg` stores only frame unwind information. If you want to step into glibc while debugging, you need to add `LD\_LIBRARY\_PATH=/usr/lib/debug` to GDB's environment. If that still does not work, try `LD\_PRELOAD=/usr/lib/debug/libc.so.0.3` instead. You can add to GDB's environment via `set env FOO bar` from the GDB command line. It seems that this is no longer needed with the Debian glibc 2.5 packages, but I may as well be wrong. Have to check that again. # Debugging Translators In order to [[debug|debugging]] translators and being able to step into glibc during it, you need the `hurd-dbg` and `libc0.3-dbg` packages installed. Then start the translator like `settrans -P /foo /usr/bin/env LD\_LIBRARY\_PATH=/usr/lib/debug /hurd/foofs`. The `-P` option will make it pause and you will be able to attach [[debugging/GDB]] to the process. Is starting the translator like this really needed? # Other Repositories If you want to use the `apt-get source` facility, make sure that `/etc/apt/sources.list` contains a line like deb-src http://ftp.de.debian.org/debian unstable main ... replacing _de_ with your homeland's code. # Kernel Logs The kernel logs are written to `/dev/klog`. Run `cat /dev/klog > foo` as root and hit `ctrl+c` after a few seconds to catch the logs. You can do this only once and do not do this in single-user mode (where `ctrl+c` does not work). # `bad hypermeta data` If you get the error `bad hypermeta data` when trying to mount an ext3 partition from GNU/Linux, that is usually because the file system has not been unmounted cleanly (maybe GNU/Linux got suspended to disk) and the Hurd cannot mount it as ext2 without checking. Either boot back into GNU/Linux and unmount it or you can try to run `fsck.ext3` from GNU/Hurd directly.