After a few days gap (busy with office work) I got back to the porting task. Finally after following the steps mentioned by UniSuperBox, I created a manifest file which looks as below

<?xml version="1.0" encoding="UTF-8"?>
<manifest>


<project path="kernel/samsung/manta" name="android_kernel_samsung_manta" remote="los" />
<project path="external/stlport" name="android_external_stlport" remote="los" />
<project path="hardware/samsung_slsi/exynos5" name="android_hardware_samsung_slsi_exynos5" remote="los" />


</manifest>

Now when I initiate the command "./halium/devices/setup manta", I end up getting following errors.

aravind@UbuntuTouch:~/halium$ ./halium/devices/setup manta
*****************************************
I: Configuring for device samsung_manta
*****************************************

... A new repo command ( 1.25) is available.
... You should upgrade soon:

    cp /home/aravind/halium/.repo/repo/repo /usr/bin/repo

fatal: duplicate path external/stlport in /home/aravind/halium/.repo/manifest.xml

... A new repo command ( 1.25) is available.
... You should upgrade soon:

    cp /home/aravind/halium/.repo/repo/repo /usr/bin/repo

fatal: duplicate path external/stlport in /home/aravind/halium/.repo/manifest.xml
*******************************************
*******************************************
aravind@UbuntuTouch:~/halium$

Then I figured the error are because of similar entries existing for stlport in files
halium/devices/manifests/samsung_manta.xml
AND
halium/.repo/manifest.xml

Now I removed the entry for stlport in file halium/.repo/manifest.xml, then tried the command "./halium/devices/setup manta"... now I see following erros

aravind@UbuntuTouch:~/halium$ ./halium/devices/setup manta
*****************************************
I: Configuring for device samsung_manta
*****************************************

... A new repo command ( 1.25) is available.
... You should upgrade soon:

    cp /home/aravind/halium/.repo/repo/repo /usr/bin/repo

Fetching projects:   8% (14/172)error: info is different in /home/aravind/halium/.repo/projects/external/stlport.git vs /home/aravind/halium/.repo/project-objects/android_external_stlport.git
error: Cannot fetch android_external_stlport (GitError: --force-sync not enabled; cannot overwrite a local work tree. If you're comfortable with the possibility of losing the work tree's git metadata, use `repo sync --force-sync external/stlport` to proceed.)
Exception in thread Thread-26:
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/aravind/halium/.repo/repo/subcmds/sync.py", line 282, in _FetchProjectList
    success = self._FetchHelper(opt, project, *args, **kwargs)
  File "/home/aravind/halium/.repo/repo/subcmds/sync.py", line 327, in _FetchHelper
    prune=opt.prune)
  File "/home/aravind/halium/.repo/repo/project.py", line 1261, in Sync_NetworkHalf
    self._InitGitDir(force_sync=force_sync)
  File "/home/aravind/halium/.repo/repo/project.py", line 2366, in _InitGitDir
    raise e
GitError: --force-sync not enabled; cannot overwrite a local work tree. If you're comfortable with the possibility of losing the work tree's git metadata, use `repo sync --force-sync external/stlport` to proceed.

Fetching projects:  15% (26/172)
error: Exited sync due to fetch errors

... A new repo command ( 1.25) is available.
... You should upgrade soon:

    cp /home/aravind/halium/.repo/repo/repo /usr/bin/repo

Syncing work tree:  44% (76/171)Traceback (most recent call last):
  File "/home/aravind/halium/.repo/repo/main.py", line 547, in <module>
    _Main(sys.argv[1:])
  File "/home/aravind/halium/.repo/repo/main.py", line 522, in _Main
    result = repo._Run(argv) or 0
  File "/home/aravind/halium/.repo/repo/main.py", line 184, in _Run
    result = cmd.Execute(copts, cargs)
  File "/home/aravind/halium/.repo/repo/subcmds/sync.py", line 855, in Execute
    project.Sync_LocalHalf(syncbuf, force_sync=opt.force_sync)
  File "/home/aravind/halium/.repo/repo/project.py", line 1383, in Sync_LocalHalf
    revid = self.GetRevisionId(all_refs)
  File "/home/aravind/halium/.repo/repo/project.py", line 1365, in GetRevisionId
    rev = rem.ToLocal(self.revisionExpr)
  File "/home/aravind/halium/.repo/repo/git_config.py", line 700, in ToLocal
    raise GitError('remote %s does not have %s' % (self.name, rev))
error.GitError: remote los does not have refs/heads/cm-14.1
*******************************************
*******************************************
aravind@UbuntuTouch:~/halium$ 

Any suggestions?!

@UniSuperBox Thanks for replying. You mentioned that the support for manta is dropped. Does that mean I cannot download the code and compile and successfully install on Nexus 10. I may need to buy a supported tablet otherwise. I did see other posts here in the forum where some people did try installing on Nexus 10 but failed.

Hi All,

I wanted to install Ubuntu Touch on Nexus 10 device. Fortunately I found that there is no out of the box port available (I always wanted to build from source manually then install). So I started following the instructions given in https://docs.halium.org/en/latest/porting/first-steps.html

I reached to a point where I am suppose to create new manifest file. I am facing issues in understanding how to create it for my device. I figured that the device repository which is https://github.com/LineageOS/android_device_samsung_manta and downloaded the lineage.dependencies file. In that file I was able to get the path and repository names for the dependencies. But I am not able to figure out what I should enter for variable "remote".

Currently following is what I have in file halium/devices/manifests/samsung_manta.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest>

<project path="device/samsung/manta" name="android_device_samsung_manta" remote="[remote]" />
<project path="kernel/samsung/manta" name="android_kernel_samsung_manta" remote="[remote]" />
<project path="external/stlport" name="android_external_stlport" remote="[remote]" />
<project path="hardware/samsung_slsi/exynos5" name="android_hardware_samsung_slsi_exynos5" remote="[remote]" />

</manifest>

I need help in putting together this file. Can someone help me with this please. I am using Ubuntu 18.04 OS.

Thanks,
Aravind