Erro SQL1641N no linux ao executar db2start usando db2 express c no linux (LUW), mas o sistema de arquivos não está montado usando nosuid

Estou tentando instalar e iniciar o db2 em minha máquina linux usando o seguinte script:

#!/usr/bin/env bash

MKDIR=/bin/mkdir
RM=/bin/rm
TAR=/bin/tar

DB2_SERVER_PROGRAM_PATH=/home/alok/Documents/Installers
DB2_SERVER_PROGRAM=v10.5_linuxx64_expc.tar.gz

echo "changing to $DB_SERVER_PROGRAM_PATH"
cd ${DB2_SERVER_PROGRAM_PATH}
echo "removing expc"
${RM} -rf expc
echo "untarring ${DB2_SERVER_PROGRAM}"
${TAR} zxf ${DB2_SERVER_PROGRAM}

echo "changing to expc"
cd expc

echo "Installing db2 as root"
sudo ./db2_install

echo "Adding user group db2grp1 as root"
sudo groupadd db2grp1
echo "Adding user group dasadm1 as root"
sudo groupadd dasadm1
echo "Adding user group db2fgrp1 as root"
sudo groupadd db2fgrp1

echo "Adding user db2inst1. Please provide password for new user db2inst1."
sudo useradd -g db2grp1 -G dasadm1 -m db2inst1
sudo passwd db2inst1

echo "Adding user dasusr1. Please provide password for new user dasusr1."
sudo useradd -g dasadm1 -G db2grp1 -m dasusr1
sudo passwd dasusr1

echo "Adding user db2fenc1. Please provide password for new user db2fenc1."
sudo useradd -g db2fgrp1 -m db2fenc1
sudo passwd db2fenc1

cd /opt/ibm/db2/V10.5/instance

echo "Creating DAS as root via user dasusr1."
sudo ./dascrt -u dasusr1

echo "Creating database instance as root via user db2fenc1 and db2inst1."
sudo ./db2icrt -u db2fenc1 db2inst1

echo "Setting communication protocol to tcpip as user db2inst1."
sudo -u db2inst1 ../adm/db2set DB2COMM=tcpip
echo "Setting SVCENAME 50000 for dbm cfg as user db2inst1."
sudo -u db2inst1 ../bin/db2 update dbm cfg using SVCENAME 50000

echo "starting db2 as user db2inst1."
sudo chmod +x ../adm/db2start
sudo -u db2inst1 ../adm/db2start

netstat -an | grep 50000

Tudo funciona bem, até chegar à penúltima linha:

sudo -u db2inst1 ../adm/db2start

SQL1641N  The db2start command failed because one or more DB2 database
manager program files was prevented from executing with root 
privileges by file system mount settings.

Agora eu verifiquei /etc/fstabe diz:

proc            /proc           proc    nodev,noexec,nosuid 0       0
/dev/sda1       /               ext4    errors=remount-ro,user_xattr 0       1
UUID=d4d794eb-1e68-4ddf-a9ec-249a22f084fb none            swap    sw             0       0
/swapfile swap swap defaults 0 0

Meu caminho de instalação /opt/ibm/db2/V10.5/admestá basicamente ativado /dev/sda1e não está montado usando a nosuidopção.

Aqui está a saída de mount:

alok@hostname:~$ mount
/dev/sda1 on / type ext4 (rw,errors=remount-ro,user_xattr)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
shmfs on /dev/shm type tmpfs (rw,size=2048m)
gvfs-fuse-daemon on /home/alok/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=alok)

Isso novamente indica que /não está montado no nosuidmodo. Então, por que estou recebendo erro SQL1641N? É um problema diferente enviar esta mensagem?