Very similar error for me:
Generating RSA private key, 2048 bit long modulus
…+++
…+++
e is 65537 (0x10001)
Generating RSA private key, 2048 bit long modulus
…+++
…+++
e is 65537 (0x10001)
Signature ok
subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost
Getting CA Private Key
loolforkit version details: 2.1.0 - b2e736a3
kit-00030-00028 15:44:46.232637 [ loolkit ] ERR symlink(“…/lo”,“/opt/lool/child-roots/30/opt/collaboraoffice5.3”) failed (errno: File exists)| kit/Kit.cpp:271
kit-00030-00028 15:44:46.233054 [ loolkit ] ERR Poco Exception: Exception: symlink() failed| kit/Kit.cpp:1895
wsd-00026-00026 15:45:35.412317 [ loolwsd ] FTL Failed to fork child processes.| wsd/LOOLWSD.cpp:2405
Failed to fork child processes.
wsd-00026-00026 15:45:35.413349 [ loolwsd ] FTL Failed to fork child processes.| wsd/LOOLWSD.cpp:2551
Failed to fork child processes.
wsd-00026-00026 15:45:35.413943 [ loolwsd ] WRN Waking up dead poll thread [admin], started: false, finished: false| ./net/Socket.hpp:445
wsd-00026-00026 15:45:35.414003 [ loolwsd ] WRN Waking up dead poll thread [admin], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414765 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414809 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414825 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414850 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414864 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.414876 [ loolwsd ] WRN Waking up dead poll thread [accept_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.415178 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445
-00026 15:45:35.415209 [ loolwsd ] WRN Waking up dead poll thread [websrv_poll], started: false, finished: false| ./net/Socket.hpp:445
frk-00028-00028 15:45:35.420734 [ forkit ] FTL Pipe closed.| common/IoUtil.cpp:309
Generating RSA private key, 2048 bit long modulus
…+++
…+++
e is 65537 (0x10001)
Generating RSA private key, 2048 bit long modulus
…+++
…+++
e is 65537 (0x10001)
Signature ok
subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost
Getting CA Private Key
loolforkit version details: 2.1.0 - b2e736a3
office version details: { “ProductName”: “Collabora Office”, “ProductVersion”: “5.3”, “ProductExtension”: “.10.10”, “BuildId”: “77b0d93c0f6ff6490e909dbd81b1994862a31b3a” }
wsd-00025-00026 15:46:05.788348 [ prisoner_poll ] WRN ForKit not responsive for 24823 ms forking 1 children. Resetting.| wsd/LOOLWSD.cpp:338
kit-00032-00027 15:46:05.872950 [ loolkit ] ERR symlink(“…/lo”,“/opt/lool/child-roots/32/opt/collaboraoffice5.3”) failed (errno: File exists)| kit/Kit.cpp:271
kit-00032-00027 15:46:05.900306 [ loolkit ] ERR Poco Exception: Exception: symlink() failed| kit/Kit.cpp:1895