Problem solved ! I forgot to fix the permissions when tinkering with the 
hierarchy of my repertoires.
Would you please tell me if this looks reasonable :

```
  $ cd /home/git ; ls -ld /home/git ; ls -l /home/git
drwxr-xr-x  6 _gotd  _gotd  512 Jan 16 23:41 /home/git/
total 64
drwxrwxr-x  4 sylvain  _gotd  512 Mar 24  2025 geomant/
drwxrwxr-x  4 sylvain  _gotd  512 Apr 26  2025 nwpg/
drwxrwxr-x  4 sylvain  _gotd  512 Mar 11  2025 saboua.xyz/
drwxrwxr-x  4 sylvain  _gotd  512 Mar  4  2025 sylvain.sab.free.fr/
  $ find nwpg -exec chown sylvain:_gotd {} \;
  $ find nwpg -type d -exec chmod 775 {} \;
  $ find nwpg -type f -exec chmod 664 {} \;
```

(I don't know why, using a wildcard instead of `nwpg' fails on some 
files. Doesn't look problematic)

Here is the log (from /var/log/daemon) extract that gave me the hint :
`Jan 16 23:33:30 lap gotd[17363]: uid 1000: mkstemps: 
/home/git/nwpg/objects/pack/receiving-from-uid-1000.pack-FS7MmbR4sO: 
Permission denied

The final lines from got send -vvv

```
debug2: channel 0: send close for remote id 0
got-send-pack: readpkt: 10:     debug3: send packet: type 97
unpackdebug2: channel 0: is dead
  okdebug2: channel 0: garbage collecting
[0x0a]
debug1: channel 0: free: client-session, nchannels 1
got-send-pack: readpkt: 19:     ok refs/headebug3: channel 0: status: 
The following connections are open:
   #0 client-session (t4 [session] r0 nm0 i3/0 o3/0 e[write]/0 fd -1/-1/8 
sock -1 cc -1 nc0 io 0x00/0x00)

ds/main[0x0a]
debug3: send packet: type 1
Transferred: sent 4900, received 4392 bytes, in 1.2 seconds
Bytes per second: sent 3929.3, received 3521.9
debug1: Exit status 0

Server has accepted refs/heads/main
```

If you're curious, you can see the update here :
https://got.saboua.xyz/?action=summary&path=nwpg

Cheers
-- 
Sylvain Saboua
looking for a PDP-11