Patching signal 9 brokes distro

[milen-prg]

After applying patch for signal 9 problem, the errors appear and can't start vnc:

~ $ echo "export PROOT_NO_SECCOMP=1" >> .bashrc && hash -r
~ $ ./start-ubuntu.sh /bin/lesspipe: 1: cd: can't cd to /bin

root@localhost:# vncserver-start
bash: /usr/local/bin/vncserver-start: Function not implemented
root@localhost:#

[milen-prg]

Also other commands don't work:

root@localhost:# apt update Reading package lists... Done
E: Method gave invalid 400 URI Failure message: Failed to set new user ids - setresuid (1: Operation not permitted)
E: Method http has died unexpectedly!
E: Sub-process http returned an error code (112)
root@localhost:#

[milen-prg]

cd function is not recognised:

root@localhost:~# cd Documents/ bash: cd: Documents/: Function not implemented

And SECCOMP patch don't help at all.