[Android Q&A, Help & Troubleshooting] cnstarz:
Hi all, I'm completely new to this and don't really know where to start. I downloaded Builduntu v2.0 and loaded it up in VirtualBox. I initiated a repo (for Nexus 6P Angler) using:

repo init -u https://android.googlesource.com/platform/manifest -b android-7.0.0_r13

It started syncing but I'm receiving these errors:

fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/clang.git'
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/clang.git'
100 1 100 1 0 0 2 0 --:--:-- --:--:-- --:--:-- 2
100 2706k 100 2706k 0 0 1205k 0 0:00:02 0:00:02 --:--:-- 2363k
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/build/kati.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/build/kati.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/iputils.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/system/tpm.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/apps/Browser2.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/ceres-solver.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/services/Telecomm.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/clang.git'
fatal: Not a git repository: '/home/android/stock_build/.repo/projects/build/kati.git'
error: Cannot fetch platform/system/tpm (GitError: platform/system/tpm pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/system/tpm.git'
)
Exception in thread Thread-59:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/system/tpm pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/system/tpm.git'

error: Cannot fetch platform/external/ceres-solver (GitError: platform/external/ceres-solver pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/ceres-solver.git'
)
Exception in thread Thread-62:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/external/ceres-solver pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/ceres-solver.git'

error: Cannot fetch platform/packages/apps/Browser2 (GitError: platform/packages/apps/Browser2 pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/apps/Browser2.git'
)
Exception in thread Thread-61:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/packages/apps/Browser2 pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/apps/Browser2.git'

error: Cannot fetch platform/external/iputils (GitError: platform/external/iputils pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/iputils.git'
)
Exception in thread Thread-58:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/external/iputils pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/iputils.git'

error: Cannot fetch platform/packages/services/Telecomm (GitError: platform/packages/services/Telecomm pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/services/Telecomm.git'
)
Exception in thread Thread-60:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/packages/services/Telecomm pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/packages/services/Telecomm.git'

error: Cannot fetch platform/external/clang (GitError: platform/external/clang pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/clang.git'
)
Exception in thread Thread-56:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/external/clang pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/external/clang.git'

error: Cannot fetch platform/build/kati (GitError: platform/build/kati pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/build/kati.git'
)
Exception in thread Thread-57:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 754, in run
self.__target(*self.__args, **self.__kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 270, in _FetchProjectList
success = self._FetchHelper(opt, project, *args, **kwargs)
File "/home/android/stock_build/.repo/repo/subcmds/sync.py", line 314, in _FetchHelper
prune=opt.prune)
File "/home/android/stock_build/.repo/repo/project.py", line 1267, in Sync_NetworkHalf
no_tags=no_tags, prune=prune)):
File "/home/android/stock_build/.repo/repo/project.py", line 2058, in _RemoteFetch
self.bare_git.pack_refs('--all', '--prune')
File "/home/android/stock_build/.repo/repo/project.py", line 2747, in runner
(self._project.name, name, p.stderr))
GitError: platform/build/kati pack-refs: fatal: Not a git repository: '/home/android/stock_build/.repo/projects/build/kati.git'

error: Exited sync due to fetch errors

I've tried doing rm -rf for each .git project that errored out, and I reran "repo sync -j 8", but I still get the same errors for those .gits. How do I fix these? Again, I'm new to this and trying to learn, so I'm sorry if I'm leaving out some key information for you guys.