I met the same problem with you about repo

I am using ubuntu 8.10, and I think my repo has been successfully
installed according to https://sites.google.com/a/android.com/opensource/download
but when Initialize a Repo client, I forgot to entry ~/mydroid
directory, and falsely initialized repo under the directory /home/gzh,
and then during the process of initializing, I realized my false, so
when it demands me to input my name, I press ctrl-c to force it stop.
The print is as follow
gzh@gzh-desktop:~$ repo init -u git://android.git.kernel.org/platform/manifest.git
gpg: 钥匙环‘/home/gzh/.repoconfig/gnupg/secring.gpg’已建立
gpg: 钥匙环‘/home/gzh/.repoconfig/gnupg/pubring.gpg’已建立
gpg: /home/gzh/.repoconfig/gnupg/trustdb.gpg:建立了信任度数据库
gpg: 密钥 920F5C65:公钥“Repo Maintainer <repo@android.kernel.org>”已导入
gpg: 合计被处理的数量:1
gpg: 已导入:1

Getting repo ...
   from git://android.git.kernel.org/tools/repo.git
warning: no common commits
remote: Counting objects: 269, done.
remote: Compressing objects: 100% (122/122), done.
remote: Total 269 (delta 136), reused 267 (delta 134)
Receiving objects: 100% (269/269), 153.23 KiB | 121 KiB/s, done.
Resolving deltas: 100% (136/136), done.
From git://android.git.kernel.org/tools/repo
* [new branch] for-gerrit2 -> origin/for-gerrit2
* [new branch] master -> origin/master
* [new branch] stable -> origin/stable
* [new tag] v1.5 -> v1.5
* [new tag] v1.5.1 -> v1.5.1
From git://android.git.kernel.org/tools/repo
* [new tag] v1.0 -> v1.0
* [new tag] v1.0.1 -> v1.0.1
* [new tag] v1.0.2 -> v1.0.2
* [new tag] v1.0.3 -> v1.0.3
* [new tag] v1.0.4 -> v1.0.4
* [new tag] v1.0.5 -> v1.0.5
* [new tag] v1.0.6 -> v1.0.6
* [new tag] v1.0.7 -> v1.0.7
* [new tag] v1.0.8 -> v1.0.8
* [new tag] v1.0.9 -> v1.0.9
* [new tag] v1.1 -> v1.1
* [new tag] v1.2 -> v1.2
* [new tag] v1.3 -> v1.3
* [new tag] v1.3.1 -> v1.3.1
* [new tag] v1.3.2 -> v1.3.2
* [new tag] v1.4 -> v1.4
* [new tag] v1.4.1 -> v1.4.1
* [new tag] v1.4.2 -> v1.4.2
* [new tag] v1.4.3 -> v1.4.3
* [new tag] v1.4.4 -> v1.4.4
Getting manifest ...
   from git://android.git.kernel.org/platform/manifest.git
warning: no common commits
remote: Counting objects: 61, done.
remote: Compressing objects: 100% (21/21), done.
remote: Total 61 (delta 22), reused 59 (delta 20)
Unpacking objects: 100% (61/61), done.
From git://android.git.kernel.org/platform/manifest
* [new branch] cdma-import -> origin/cdma-import
* [new branch] cupcake -> origin/cupcake
* [new branch] donut -> origin/donut
* [new branch] master -> origin/master
* [new branch] release-1.0 -> origin/release-1.0
From git://android.git.kernel.org/platform/manifest
* [new tag] android-1.0 -> android-1.0
Branch default set up to track remote branch refs/remotes/origin/
Switched to a new branch "default"

Your Name [gzh]: ^Cgzh@gzh-desktop:~$

and then, I turned back to my home directory and entered mydroid
$ cd mydroid/
Once again, I use the command
$ repo init -u git://android.git.kernel.org/platform/manifest.git

this time error occurs, here is the print
gzh@gzh-desktop:~/mydroid$ repo init -u git://android.git.kernel.org/platform/manifest.git
fatal: A branch named 'default' already exists.
Traceback (most recent call last):
  File "/home/gzh/.repo/repo/main.py", line 202, in <module>
  File "/home/gzh/.repo/repo/main.py", line 186, in _Main
  File "/home/gzh/.repo/repo/main.py", line 96, in _Run
    cmd.Execute(copts, cargs)
  File "/home/gzh/.repo/repo/subcmds/init.py", line 192, in Execute
  File "/home/gzh/.repo/repo/subcmds/init.py", line 124, in
  File "/home/gzh/.repo/repo/project.py", line 777, in StartBranch
    raise GitError('%s checkout %s ' % (self.name, rev))
error.GitError: manifests checkout refs/remotes/origin/master

what should I do now ?