Ubuntu 18.04.2 LTS

Ubuntu 18.04.2 LTS

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Product Details

Ubuntu 18.04 ships with a v4.15 based Linux kernel, enabling the latest hardware and peripherals available from IBM, Intel, and others. The 18.04 kernel delivers new features inherited from upstream, including:

CPU controller for the cgroup v2 interface
AMD secure memory encryption support
The latest MD driver with software RAID enhancements
Improved power management for systems with SATA Link Power Management
We also see notable Ubuntu specific achievements with:

Linux security module stacking support
Support for signing of POWER host and NV kernels
Backport improved support for IBM and Intel hardware from Linux 4.16

In Ubuntu 18.04 LTS, gcc is now set to default to compile applications as position independent executables (PIE) as well as with immediate binding, to make more effective use of Address Space Layout Randomization (ASLR). All packages in main have been rebuilt to take advantage of this, with a few exceptions.

Mitigations are in place to protect against Spectre and Meltdown. See the Spectre and Meltdown KnowledgeBase article for more details about the remediation and configuration options.

bolt and thunderbolt-tools have been promoted to main to provide security controls for Thunderbolt devices.

Default CIFS/SMB protocol version change in CIFS mounts
Since 17.10, the default SMB protocol used when mounting remote CIFS filesystems via mount.cifs (from the cifs-utils package) changed to 2.1 or higher, depending on what is negotiated with the server. If no version is specified when mounting such a remote share, the following will be logged:

No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3),
from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3
(or SMB2.1) specify vers=1.0 on mount.
Should you encounter compatibility issues, like #1764778 or #1572132, please specify vers=1.0 when mounting the share and please file a bug if that fixes the problem for you.