I would like to upgrade my Ubuntu release 19.10 to 20.04 LTS. How can I do this? I tried the software update and upgrade, but that would just upgrade my packages.
Recently I have installed an older version of Ubuntu on my old machine. Whenever I try to install any software, I get an error saying it couldn't be found:  $ sudo apt-get install vlc Reading package lists... Done                Building dependency tree        Reading state information... Done     E: Couldn't find package vlc
How to change text format of summary/trimmed field? Is there a straightforward way to change the summary/trimmed text to "full html" in Drupal 8?  There are workarounds such as creating separate body fields and using them as the summary but I am specifically asking about changing the text format of default summary/trimmed field of "Text (formatted, long, with summary)".  To put it another way, how to I add the CKEditor bar to the summary/trimmed text. Let $\alpha$ be an irrational real number and let $a_j$ be a sequence of rational numbers converging to $\alpha$. Suppose that each $a_j$ is a fraction expressed in lowest terms: $a_j = \alpha_j / \beta_j$. Prove that the $\beta_j$ tend to $\infty$  Attempt: AFSOC that $\beta_j$ does not tend to infinity, then it is bounded by some $M$. We can also find an interval $\alpha \in (k, k+1)$. Let $\epsilon &gt; 0$, $\exists N_0$ such that for all $N &gt; N_0$ we have $|a_N - \alpha|  &lt; \epsilon$. So $|\frac{p_N}{q_N} - \alpha| &lt; \epsilon$. We try to use the fact that $q$ is bounded but fail to derive a contradiction. I do not know how to use the fact that $\alpha$ is between two integers, although it might not be relevant at all.  Ideas? Determine Whether Two Date Ranges Overlap How to add a default item to a custom taxonomy? Wordpress default taxonomy (Categories) has the item Uncategorized by default. How to add a default item to a new custom taxonomy?  functions.php:  // === CUSTOM TAXONOMIES === // function my_custom_taxonomies() {     register_taxonomy(         'block',        // internal name = machine-readable taxonomy name         'static_content',       // object type = post, page, link, or custom post-type         array(             'hierarchical' =&gt; true,             'labels' =&gt; array(                 'name' =&gt; __( 'Blocks' ),                 'singular_name' =&gt; __( 'Block' ),                 'add_new_item' =&gt; 'Add New Block',                 'edit_item' =&gt; 'Edit Block',                 'new_item' =&gt; 'New Block',                 'search_items' =&gt; 'Search Block',                 'not_found' =&gt; 'No Block found',                 'not_found_in_trash' =&gt; 'No Block found in trash',             ),             'query_var' =&gt; true,    // enable taxonomy-specific querying             'rewrite' =&gt; array( 'slug' =&gt; 'block' ),    // pretty permalinks for your taxonomy?         )     ); } add_action('init', 'my_custom_taxonomies', 0);   EDIT: I just want to have the taxonomy item there when the theme is installed. It doesn't have to automatically be added to any empty term. Center figure that is wider than \textwidth How do I hide an element when printing a web page? Conditional clause (then) In this first instance the main clause only stands alone if you  omit (then).  But in the other example it clearly has a main clause. So would this be classed as an embedded main clause as it only works as a independent clause if it's adjusted and or if it's joined with a dependent clause.  If I have enough money, then I will buy a new car.  If it rains, the picnic will be cancelled.  The picnic will be cancelled if it rains. How do I know when to use "the" versus "a" versus "∅" as an article on a noun? With proper nouns, we don't use the except for river names, newspaper names, etc.  I want to know why we use the with White House. I mean, under which rule can we categorize it? What could other similar examples for that rule be? default constructor for int Interview question: three arrays and O(N*N) I watched a video on  and read a few  which say that human beings see 3D because we have two eyes. But does that mean when I close one of my eyes, I should see 2D? It doesn't happen so. Why am i still able to be understand depth? Would a person with one eye not be able to perceive depths? Stop all active ajax requests in jQuery Some three-digit (incl. minus sign) vote count still doesn't display properly Related:      As the title says...    The Android app version is 0.1.58.  Here is my experimental results:   Vote counts >= 200 that I've tried seems to be fine Vote count == 241 has problem, 242 doesn't Vote counts which matches /^1[012345689][0-9]$/ seems to be having problem (may be overgeneralized) Vote count == -36 definitely has problem   Note that this is not a tablet, but a 4-inch mdpi phone, of 480x854px. I am a Pakistani national and need to transit through Dubai International Airport (DXB).  I am not planning to leave the airport and both of my flights (arrival and departure) are from Terminal 3.  I am pretty sure that I do not need transit visa at the DXB, however it is no where mentioned on any of their official website.   Can anyone please provide me such a link stating that transiting without leaving the airport does not require visa at DXB, as I need to use this link as a proof for a visa application?  Thanks Show that $Kf(x,y)=\int_0^1k(x,y) f(y) \,dy\\$ is linear and continuous Let $k:[0,1]\times[0,1]\rightarrow \mathbb{R}$ continuous and $K:C[0,1]\rightarrow C[0,1]$, given by $Kf(x,y)=\int_0^1k(x,y) f(y) \,dy\\$. Prove that $K$ is continuous. I try to see continuity in $0$, but i can't find $\delta$. Is there a robust command line tool for processing csv files? Sample size for logistic regression? I want to make a logistic model from my survey data. It is a small survey of four residential colonies in which only 154 respondents were interviewed. My dependent variable is "satisfactory transition to work". I found that, of the 154 respondents, 73 said that they have satisfactorily transitioned to work, while the rest did not. So the dependent variable is binary in nature and I decided to use logistic regression. I have seven independent variables (three continuous and four nominal). One guideline suggest that there should be 10 cases for each predictor / independent variable (Agresti, 2007). Based on this guideline I feel that it is OK to run logistic regression.    Am I right? If not please let me know how to decide the number of independent variables? Sometimes it takes too long for the network manager to update to see new wireless AP. Is it possible to change the time interval between checks? Show that one-sided limits always exist for a monotone function (on an interval) Show that one-sided limits always exist for a monotone function on an interval $[a,b]$.  Me attempt:  1) If a function is monotone on an interval $[a,b]$, then $f(a)\le f(x) \le f(b)$ for $x\in[a,b]$. Therefore if there exists left-hand (right-hand) limit of this function at a given point, then it must be finite. Now we must show that a both left-hand and right=hand limits exist. We use the fact that if we take a sequence $(x_n)\rightarrow c^{+} \in [a,b]$ then $f(x_n)$ is bounded and monotone and therefore it is convergent. What I am asking here is to please remove the privilege to participate in Meta for MSE.  This privilege is literally useless. You can't really have a meta site for a meta site. There's no Meta.Meta.SE here or any other SE site out there: Meta.SE covers for every site in SE, including itself.     When users find out that you don't really get anything new, it's kinda sad for those people. There is no use for it except just to be there and fill up the space between the first and third privilege. Privileges should be shown only if you earn something new, and this privilege to participate in the meta isn't new because it's where you report problems in all of SE, including Meta.SE.    So please remove the privilege to participate in meta just for Meta.SE.    This is not a dupe as this is a feature-request to remove it, not support on why it is there.