Yes, the issue is solved:
# uname -r
5.8.0-16-generic
# lsmod | grep iptable_
iptable_filter 16384 1
iptable_nat 16384 1
nf_nat 49152 3 ip6table_nat,iptable_nat,xt_MASQUERADE
iptable_mangle 16384 1
ip_tables 32768 13 iptable_filter,iptable_nat,iptable_mangle
x_tables 45056 19
ebtables,ip6table_filter,xt_conntrack,iptable_filter,xt_NFLOG,xt_tcpudp,xt_addrtype,xt_CHECKSUM,ip6t_rt,xt_geoip,ip6_tables,ipt_REJECT,ip_tables,xt_limit,xt_hl,ip6table_mangle,xt_MASQUERADE,ip6t_REJECT,iptable_mangle
# systemctl status netfilter-persistent
● netfilter-persistent.service - netfilter persistent configuration
Loaded: loaded (/lib/systemd/system/netfilter-persistent.service; enabled;
vendor preset: enabled)
Drop-In: /etc/systemd/system/netfilter-persistent.service.d
└─iptables.conf
Active: active (exited) since Thu 2020-08-13 00:45:54 CEST; 6min ago
Docs: man:netfilter-persistent(8)
Main PID: 1073 (code=exited, status=0/SUCCESS)
Tasks: 0 (limit: 18998)
Memory: 0B
CGroup: /system.slice/netfilter-persistent.service
Aug 13 00:45:53 samsung5-ubuntu systemd[1]: Starting netfilter persistent
configuration...
Aug 13 00:45:53 samsung5-ubuntu netfilter-persistent[1084]: run-parts:
executing /usr/share/netfilter-persistent/plugins.d/15-ip4tables start
Aug 13 00:45:54 samsung5-ubuntu netfilter-persistent[1084]: run-parts:
executing /usr/share/netfilter-persistent/plugins.d/25-ip6tables start
Aug 13 00:45:54 samsung5-ubuntu systemd[1]: Finished netfilter persistent
configuration.
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1891020
Title:
No IPv4 iptable kernel module can be loaded
Status in linux package in Ubuntu:
Fix Released
Bug description:
Ubuntu groovy
linux-modules-5.8.0-12-generic 5.8.0-12.13
# uname -r
5.8.0-12-generic
After reboot,
1) no IPv4 iptable kernel module are loaded:
# lsmod|grep iptable
#
2) all IPv4 iptable kernel modules are present:
# find /lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter -name
"iptable_*"
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_filter.ko
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_nat.ko
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_mangle.ko
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_raw.ko
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_security.ko
3) No IPv4 iptable kernel modules can be loaded:
# for module in iptable_filter iptable_nat iptable_mangle; do modprobe
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/${module}.ko; done
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_filter.ko not
found in directory /lib/modules/5.8.0-12-generic
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_nat.ko not
found in directory /lib/modules/5.8.0-12-generic
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_mangle.ko not
found in directory /lib/modules/5.8.0-12-generic
4) Same issue after re-creating the module dependency:
# depmod
# for module in iptable_filter iptable_nat iptable_mangle; do modprobe
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/${module}.ko; done
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_filter.ko not
found in directory /lib/modules/5.8.0-12-generic
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_nat.ko not
found in directory /lib/modules/5.8.0-12-generic
modprobe: FATAL: Module
/lib/modules/5.8.0-12-generic/kernel/net/ipv4/netfilter/iptable_mangle.ko not
found in directory /lib/modules/5.8.0-12-generic
No such issue with linux-modules-5.4.0-42-generic.
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