Should i upgrade to 4.1

If you successfully followed all of these steps, you should now be running Rails 4. Do you have any other tips? Share it with us in the comments section. If you need help with your Rails upgrade project, contact us! If you enjoyed this article, follow me on Twitter! Upgrade Rails from 4. Updated on March 5, Mauro Otonelli. To migrate dynamic finders to Rails 4. Make sure to remove this configuration because it does nothing. Updating to iOS 4.

The OS download and update process will take some time. Once the update is complete, go through your iPhone and make sure your settings are correct. The two places we suggest checking right away are Mail accounts and Calendars because those are areas where users have had issues with prior iPhone operating system upgrades.

Next, scroll down to the bottom of that preference list and confirm that Default Calendar is also set properly. Post-Update Advice Most early reports are showing that the upgrades have been downloading and installing without a hitch. Because the update completely replaces the firmware on your iPhone, the first post-upgrade Sync will trigger a backup that will take a long than usual time.

Thus, if you have multiple mirror locations, list first the ones on local hard disks, then CD-ROM s, and then remote mirrors. A release can often be referred to both by its codename e.

Referring to a release by its codename has the advantage that you will never be surprised by a new release and for this reason is the approach taken here. It does of course mean that you will have to watch out for release announcements yourself. If you use the status name instead, you will just see loads of updates for packages available as soon as a release has happened. Debian provides two announcement mailing lists to help you stay up to date on relevant information related to Debian releases:.

By subscribing to the Debian announcement mailing list , you will receive a notification every time Debian makes a new release. Such as when bullseye changes from e. By subscribing to the Debian security announcement mailing list , you will receive a notification every time Debian publishes a security announcement. On new installations the default is for APT to be set up to use the Debian APT CDN service, which should ensure that packages are automatically downloaded from a server near you in network terms.

As this is a relatively new service, older installations may have configuration that still points to one of the main Debian Internet servers or one of the mirrors. To make use of the CDN service, add a line like this to your APT source configuration assuming you are using main and contrib :. However, if you get better results using a specific mirror that is close to you in network terms, this option is still available.

If you inspect that mirror with a web browser, you will notice that the main directories are organized like this:. To configure APT to use a given mirror, add a line like this again, assuming you are using main and contrib :.

Again, after adding your new sources, disable the previously existing archive entries. Instead of using remote package mirrors, you may wish to modify the APT source-list files to use a mirror on a local disk possibly mounted over NFS. To use this with apt , add this line to your sources. After adding your new sources, disable the previously existing archive entries in the APT source-list files by placing a hash sign in front of them.

Note that there must be no spaces between the words noauto,ro in the fourth field. The recommended way to upgrade from previous Debian releases is to use the package management tool apt. In scripts one should use apt-get , which has a stable output better suitable for parsing.

There should not be any sources entries pointing to buster. Then if a problem occurs, you will have a log of what happened, and if needed, can provide exact information in a bug report.

To start the recording, type:. If you have to rerun the typescript e. The typescript will also allow you to review information that has scrolled off-screen. After you have completed the upgrade, you can stop script by typing exit at the prompt.

If you have used the -t switch for script you can use the scriptreplay program to replay the whole session:. First the list of available packages for the new release needs to be fetched. This is done by executing:. Users of apt-secure may find issues when using aptitude or apt-get. For apt-get, you can use apt-get update --allow-releaseinfo-change. You have to make sure before upgrading your system that you will have sufficient hard disk space when you start the full system upgrade described in Section 4.

After the download, you will probably need more space in other file system partitions in order to both install upgraded packages which might contain bigger binaries or more data and new packages that will be pulled in for the upgrade. If your system does not have sufficient space you might end up with an incomplete upgrade that is difficult to recover from.

Before executing the upgrade, you can see this estimate by running:. Running this command at the beginning of the upgrade process may give an error, for the reasons described in the next sections. In that case you will need to wait until you've done the minimal system upgrade as in Section 4.

If you do not have enough space for the upgrade, apt will warn you with a message like this:. Cleaning up the package cache by running apt clean will remove all previously downloaded package files.

Remove forgotten packages. If you have used aptitude or apt to manually install packages in buster it will have kept track of those packages you manually installed, and will be able to mark as redundant those packages pulled in by dependencies alone which are no longer needed due to a package being removed. They will not mark for removal packages that you manually installed. To remove automatically installed packages that are no longer used, run:.

You can also use deborphan , debfoster , or cruft to find redundant packages. Do not blindly remove the packages these tools present, especially if you are using aggressive non-default options that are prone to false positives. It is highly recommended that you manually review the packages suggested for removal i. Remove packages that take up too much space and are not currently needed you can always reinstall them after the upgrade. If you have popularity-contest installed, you can use popcon-largest-unused to list the packages you do not use that occupy the most space.

You can find the packages that just take up the most disk space with dpigs available in the debian-goodies package or with wajig running wajig size. They can also be found with aptitude.

This will give you a handy list to work with. Remove translations and localization files from the system if they are not needed. You can install the localepurge package and configure it so that only a few selected locales are kept in the system.

Do not use an NFS mount as the network connection could be interrupted during the upgrade. You can create the temporary cache directory on whatever filesystem is mounted on your system. Do a minimal upgrade of the system see Section 4. This will make it possible to upgrade the system partially, and allow you to clean the package cache before the full upgrade. Note that in order to safely remove packages, it is advisable to switch your APT source-list files back to buster as described in Section A.

If you are upgrading remotely, be aware of Section 5. In some cases, doing the full upgrade as described below directly might remove large numbers of packages that you will want to keep. We therefore recommend a two-part upgrade process: first a minimal upgrade to overcome these conflicts, then a full upgrade as described in Section 4.

This has the effect of upgrading those packages which can be upgraded without requiring any other packages to be removed or installed. The minimal system upgrade can also be useful when the system is tight on space and a full upgrade cannot be run due to space constraints.

If the apt-listchanges package is installed, it will in its default configuration show important information about upgraded packages in a pager after downloading the packages. Press q after reading to exit the pager and continue the upgrade.

Once you have taken the previous steps, you are now ready to continue with the main part of the upgrade. This will perform a complete upgrade of the system, installing the newest available versions of all packages, and resolving all possible dependency changes between packages in different releases.

If necessary, it will install some new packages usually new library versions, or renamed packages , and remove any conflicting obsoleted packages.

You might have to insert the same disc multiple times; this is due to inter-related packages that have been spread out over the discs. This can be resolved by either using aptitude to choose these packages for installation or by trying apt install package. The following sections describe known issues that might appear during an upgrade to bullseye. In some cases the apt full-upgrade step can fail after downloading packages with:. Another possible workaround for this problem is to temporarily add both buster and bullseye sources to your APT source-list files and run apt update.

The upgrade process to bullseye might ask for the removal of packages on the system. The precise list of packages will vary depending on the set of packages that you have installed. These release notes give general advice on these removals, but if in doubt, it is recommended that you examine the package removals proposed by each method before proceeding. For more information about packages obsoleted in bullseye, see Section 4.

It is possible that a system's dependency structure can be so corrupt as to require manual intervention. Usually this means using apt or. A file conflict will result in an error like:. You can try to solve a file conflict by forcibly removing the package mentioned on the last line of the error message:.

After fixing things up, you should be able to resume the upgrade by repeating the previously described apt commands. During the upgrade, you will be asked questions regarding the configuration or re-configuration of several packages.

You can always revert to the old versions, since they will be saved with a. If you're not sure what to do, write down the name of the package or file and sort things out at a later time. You can search in the typescript file to review the information that was on the screen during the upgrade. If you are running the upgrade using the system's local console you might find that at some points during the upgrade the console is shifted over to a different view and you lose visibility of the upgrade process.

For example, this may happen in systems with a graphical interface when the display manager is restarted. Replace F1 with the function key with the same number as the virtual terminal the upgrade was running in.

This section explains how to upgrade your kernel and identifies potential issues related to this upgrade. Note that a lot of information in this section is based on the assumption that you will be using one of the modular Debian kernels, together with initramfs-tools and udev.

If you choose to use a custom kernel that does not require an initrd or if you use a different initrd generator, some of the information may not be relevant for you. These metapackages will automatically pull in a newer version of the kernel during upgrades.

You can verify whether you have one installed by running:. If you do not see any output, then you will either need to install a new linux-image package by hand or install a linux-image metapackage. To see a list of available linux-image metapackages, run:. If you are unsure about which package to select, run uname -r and look for a package with a similar name.

You may also use apt to see a long description of each package in order to help choose the best one available. For example:. You should then use apt install to install it. Once this new kernel is installed you should reboot at the next available opportunity to get the benefits provided by the new kernel version.